A lot of revolutions were carried out by people with very little resources - Mao led his army from under-developed hills, the October Revolution didn't have much of an industrial base either, nor did the left in the Spanish civil war (although the military eventually won, but hey, they had a fighting chance).

And aside from that, many revolutions happen relatively peacefully. For example Chile or South Africa. Although the latter case did have some violence and property destruction.

And aside from that, guns in the USA (assuming we're talking about this and not Europe) are cheap and plentiful. And a large, determined, but poorly-armed opposition has often beaten the smaller, well-armed forces of decadent states in the past.

Let's hope it doesn't come to that though - even a peaceful movement can succeed if it's widespread.