you just gotta kinda pry them off, they are held on with adhesive...and use double sided tape to put them back on...I had mine painted when I had my whole car painted, it makes a world of difference ...where are you from...if you are from Socal I can get you hooked up...if not they shouldnt be more than $100
so heres the rundown. start at either end, with a plastic putty kinfe, run it along until you can fit your hand underneath it (or just your fingers) then start to peel it off. Use force but not excess, or you will snap the moulding in 2. keep it going until you reach the end. the quarter panel moulding was harder for me to get off, I ended up chewing one of them off with what I was using, but it was okay since i was just throwing them out anyways.
good luck mang, and painting those bastards will cost about $150... they are rough plastic, they need to be sanded completely down, prepped, and painted. if your going to paint the quarter panel moulding too, your looking at another $50