In terms of a modern enemy or more simply in terms of Libya today.  Some of the simple things are: did you know the average tank can only run about 3-4 hours without refueling!  That is a very significant reality; because they will retreat/ therefore they will spend time coming into battle; that leaves them with 3 hours or less actual time in confronting you.  A tank is intended to be a hard target, and it is unless you run it out of fuel or can attack the tracks to immobilize it.  Keep it moving if you dare.  The other distinct possibilities are limited to running over a mine if you know its path; otherwise a mine is likely to hurt you instead.  Finding the means to get aboard the tank from behind; if you can open it/ you can stop it.  If you can “throw paint/ mud” over the sighting telescope so they cannot see/ you can stop it. a “paint drop” from overhead is just as effective if prepared correctly.  If you can open the fuel tank, a variety of things can be done to ruin the engine or light it on fire.  The engine is in the back, therefore if you can  put an rpg there or gunfire, the probability for older tanks is you can take the engine out.  If you can determine the path it will take, you can camouflage two trenches with a hard middle in the center.  If the track runs into either side or both trenches the machine is stuck, or seriously hampered for several minutes; the tracks are to be entangled or damaged, if that tank is moving and it is realistic.   If you can insure the tank is moving over ten miles per hour, you can camouflage a pit, because a sudden stop is just as effective or more so, than an artillery shell.   One of methods for inner city fighting is the electricity overhead.  If a live wire touches an armored vehicle, those inside will be electrocuted.

 SIMPLER to do, is to wait for the fuel truck, and make certain it does not come; THEN you inherit the tank,  etc.  Because they will run out of fuel.  And when it does, the guns cannot rotate anymore.  With artillery, the trucks which contain the shells are your greatest enemy.  Find them.   A fleet of cars is just as effective to breech enemy lines as a tank/ when the flanks are completely open.  That means in effect the battlefield is 360 degrees around the artillery, and they can or will be taken.   The alternate to that is, when invading cities the expectation of any invader  is to steal the fuel from any filling station that exists, including trucking, or business centers and so on.  But without electricity, if they are not fully prepared;   you can simply cut the electric lines and they will be stopped.   You can wait until they are close/ it is also completely possible to prepare the fuel delivery lines with “things engines can run on”/ so when they do fill up, it won’t run long.  You can also pump the stations dry if you can store it.  Other options exist. To pump means they must open the hatch, and stand outside; are you ready.   The object is; don’t fight with a tank/ although if you must, learn and find a bazooka. 
In terms of fighting with the tank or soldiers, etc; a small force must be camouflaged; and ready when the opportunity presents.  The most prolific way is to dig foxholes/ manholes; covering them over with a man inside; along the path. Two small mirrors in a cardboard box, lets you see.  That gives you the surprise, and it gives them a hard target to hit, and only one individual at a time to hunt.  While they are busy with one man/ the rest can be reminding them “I ain’t alone”.  Another 360 degree battlefield;   where your side is firing upward, so as not to hit each other.   Fire will burn tires/ grenades directly in the track will do them harm.    Kill the radiator, and the machine will not go far.  One of the more important characteristics of this is:   spread your camouflage covers out on the ground around an area the enemy will go through.  After an attack or two, they will be concerned, and spend a lot of time wondering what to do.  Airplanes and artillery will no doubt assault these area’s but they need neither be dug or with people in them; it’s a fake.  What can be faked, can be made into a trap;   do you not now know where the guns are.  Or they are busy here/ we will go there.

 The functional reality of air assault is a greater problem/ but the foundation reality:  when it is a big problem;   very simply the best method is no planes at all.  Do you NOT know where they land and are stored?  The best offense in a small battleground is to know where the logistics meet their needs.  An airport is not hidden; an army can be quick even if its in cars and trucks.   If they see you retreat and follow/ HAVE A PLAN, and be prepared to trap them.  Camouflage is an absolute necessity as you learn how to position yourselves/ threats (bombs, small groups infiltrating) from more than one side, will keep them guessing.   An air assault in jets is nearly worthless without a high value target for it to attack.  So don’t gather in one place.  Don’t leave valuable tools without camouflage; leave alone any site you don’t want damaged.  Move the women and children to one city, and make it clear this is where they are;  a neutral zone.  Keep it that way.  If attacked, the reality of who is the real enemy is proven.

  Do find a way to create “fake weapons” so they use bombs without cost to you.  Keep them from strafing you (planes,  lining up at low levels) with simple weather balloons on cables ; they can’t fly through them without potential real  damage to the plane.  A small bomb attached by remote control, or hard wiring ( be camouflaged/ or dug in);  with shrapnel can be deadly to an airplane.  The purpose is to get debris in the engines; detonate prior to the plane arriving. These same weather balloons on cables, can be very hazardous to a helicopter as well;   it keeps them at a distance, or requires lots of ammunition spent on low value targets/ while you shoot at them.  If you have no light gas for a balloon/ then hot air balloons can rise quickly enough, and hold a lot of explosive/ or a lot of cable to entangle a helicopter or plane.  The explosive is expected to spread a wide area with a variety of debris including such things as will hand in the air for a short time; to get in an engine.   Either between balloons or from the ground/ with wire  strands of varying kinds; an engine,  Don’t need much, if it gets in the engine or blades, there will be trouble for the machine.  Got a lot of birds handy?  They will learn to avoid that, however just the fact “its not free” might cost them a plane or two.  And if they come shooting them down, it gives you a direct trajectory for firing back.  With airplanes it is always best to take the fight to them/ A LOT of small boats on a big ocean; can move a lot of people.
When shooting at a plane with anti-aircraft guns: pick a spot that you believe the plane will come to or pass through, and start firing there well in advance of the plane/ continue firing until the plane has pasted.  Then do it again.  If you are the primary target, then he is coming straight at you.  PICK A SPOT WELL IN ADVANCE of where that plane will be in less than one minute, and fire for one and a half minutes.  Fire no more than that until the next approach; because ammo is necessary. In other words DON’T try to hit the plane/ let the plane come to the bullets, and hit itself.  If you can get to the field or tank etc when not in motion “sand in the tank/ gun barrel/ jet engine etc is very effective.  Loose fuel and oil filters/etc.
When you are a resident of the nation, you can and do blend in very well.  As is seen in all wars, can’t pick out who is an enemy means;   we walk somewhat for free.  A very important fact when fighting machines.  Go with numbers, go at night, go with communications; such as an am frequency radio to broadcast to the people in a particular town and yourselves (using codes); this is for your freedom too.

 In a SIMPLE REBELLION, the people are not warriors/ which means they don’t know what to do.  Thereby provide objectives per group, so they do know what to do.   People gather themselves in groups of one hundred or so;   “It’s a platoon”/ give them identification, and let them pick a leader for themselves; out of two or three.  These are “sergeants”: such as,  YOU go take out this ammunition shed, or whatever is deemed necessary.  HAVE A PLAN. Do your homework if you can/ take out their communications; and so on.
Every civil war is about leaders.  The true objective is: HOW TO KILL A LEADER/ because once the head is dead.  They are just as disorganized as you.  Even if the leader is insane, once dead/ the rest will be fighting, help them fight themselves with propaganda.   To see who gets control is irrelevant/ what is important is.  The most useful tool is to make the leader believe ANYONE of his “trusted companions” could be out to kill him.  That leaves the entire organization on edge.  Suggest the son could be an assassin.  People can be hired/ bribed/ forced/ and by other methods as  leaders know very well/ therefore they too, can be made to believe “I going to die”.

 One of the more interesting methods for minimal forces is if you have a little knowledge/ YOU CAN sew or glue together plastic tarp’s to make hot air balloons.  Explosives underneath can be dropped onto “a wide variety of buildings, such as palaces, or barracks”.  What you need is simple: a small propane cylinder and burner assembly such as several steel pipes with holes drilled in them;  tied together, with an ignition source.   Experiment, find the right combination, altitude and so on;    find the right wind and distance the balloon can go!  Something to control the gas would also be very useful, or have the burner flame set for the elevation needed; don’t forget to adjust for weather and temperature.  Use the gas as a liquid out, with an evaporator unit on top, so it doesn’t freeze.  Use a tripod to stand it up so as not to make noise, when expanding the balloon;  it will come out as the balloon rises;  and a blackout screen is used, to keep the flames from giving you away.  Once air-born in the right area, understanding the wind, so the balloon goes where you want it to go.  The common cell phone bomb/ or whatever you have will release your explosive and fire bomb.  Use people at right angles to the drop zone so as to known when to drop the bomb. Be prepared either to hide, or run away/ or fight as the case may be.  Use a pipe hanging vertically at different distances from the bottom of the balloon for the bomb. As this is the hardest object to hit with gunfire
At any sign of trouble, particularly fire, the leader is going to try to escape; that should be a clue as to methods of killing him as would be something suitable for helicopter escape, or car.  Bullet proof vehicles are very heavy/ they don’t run well over such things as railroad ties placed in the road.  If you prove to be formidable; the common soldier is likely to join you more each time; try not to alienate them, but provide an opportunity instead.  But as always a traitor will be among them. The difference is, generally greed (people are bribed, to stay with tyrants):   pay attention, because while the common man wants more.  The traitor is used to more, and generally aggressive if given the opportunity.  Don’t convict without substance/ send them to the front, where the heaviest fighting is; but not with a “big gun”.