Thing is with Body kits mate is its sometimes best to pay someone to put them on, you can end up making your motor look like a polished turd! I would recommend RT performance, they look after us celica club folk and if your mini project went wrong you could end up paying more to have it put right again anyway
On the other hand, if you are insistent on giving it a try, then youtube is your friend, I did some fiberglass work on a couple of bits I have in my garage and they turned out really good, but I did spend many many hours studying and practicing and even then I was not happy with it.