Psycho, Repotting isnt a bad thing, in most cases it enables a larger root system to grow (the main reason to do it) it strengthens the plant, and just does good stuff all round.
Line up some stems with some little wooden sticks/bamboo, whatever, and tie them off with some gardening wire, or the stuff you tie sandwich bags up with.
This will help to prevent your plant from bending while repotting, the important thing is to make sure the roots see as little light as possible.
Partially fill the pot with your soil, add your plant, add more soil around the plant and pat down.
I've never moved one whilst flowering, I only do it shortly before flowering to allow sufficient root growth, although I can't see any reason why not to
{EDIT} If you don't feed your plants, they will die. You should change what they feed them.
N-P-K are the 3 main ingredients of plant food.
In flowering stage you should increase the P i think