too see if you would even be able to do it yourself. Any experience fiberglassing?(if they are major cracks) or bondoing (if minor scrapes and such) Also, you most likely wont be able to paint it to match too well. Your better off with a body shop
I had a Fiberglass bodykit and to put it plainly... they suck.
Ya, they are cheap. Ya, they go on there. and Ya, they break and chip all the damn time. Your never gonna be free of cracks. The material just cant stand upto the conditions of driving down roads on a regular basis.
If you want it to look good, and last, get one in Polyurethane. Also Fiberglass is annoying to match up to the body, and Polyurethane is basicly OEM fitment with alittle work.