The no fly zone is a relatively politically neutral reaction, it seems a fairly safe bet that the rebels will win this (though you never know war can be tricky), and if they win it will more than likely just be seen as an attempt to curry favor with the local populace, it won't win them any points, but at least it can't be said they stood by and did nothing.... that is to say if the no-fly zone ever actually happens.
My suggestion for the rebels once the no fly zone is in effect (which it really should be) is to feint towards Sirte and force Loyalists to fortify it, then surround and bypass it. If they attempt a breakout, keep them bottled in until they surrender, which should be accepted immediately and peacefully. If he is foolish enough to commit a significant force to defend his hometown, they should be kept from leaving. If he does not, then it is a PR victory for the rebels and gives them time to prepare for encircling Tripoli.
RPG teams should hide in ambush for the tanks that will likely try to take and control major roads. Some RPG teams in reserve in secondary positions that can reinforce the most likely tank route and in addition be in position to cover other possible tank routes would be advisable as well.
This would be to prevent an armored breakthrough, which if given enough fuel, could cause immense damage to limited supplies if even small group of tanks were to get through.
I mostly agree, but:
A) You can't rely on your opponents to respond sanely to your actions, emotions run strong in tense situations, there's a decent chance they wouldn't surrender and you'd be stuck positioned around a well defended pocket of enemy resistance.
B) An rpg ambush might not be as effective as you think it would be, it's a good idea don't count on it being all that effective at preventing armour from breaking through.
C) Modern warfare tends to rely less on supplies, mostly because it tends to be more short term, nevertheless it is a consideration.
Personally I'd focus on morale attrition, they can't beat them in terms of supplies but in terms of will to fight time is on their side. I'd go for hit and run strikes to keep the opponents on their toes, constantly watching out for the next attack. That should whittle them down, and a propaganda attack would go down well if you could actually pull it off, which would be pretty tricky.
I think I'm pretty damn certain that Qaddafi is telling his troops that everything is in hand and that it's only a small segment of the military and populace that's against them. If you can convince them that's not true then most of them would probably turn, even so I'd try to place emphasis on making them desert, because not everyone would want to fight for the rebellion but it would be easier to convince them to stop fighting for Qaddafi and against the rebels.