well, you can refinish 2 ways. one is to just scuff the finish, and spray over, the other is a lot more labor intensive, but in my opinion, will yield a better result. you'll have to completely strip the body, prep it, then paint it.
if you're doing a sunburst, reranch has some aerosols that are suppoes to be pretty easy to use and give good sunburst results. plus, reranch is easy as hell to use...as long as you're in the US, it'll be shipped to your door in about 5 days. i suggest you check them out for a tutorial on how to finish, int he first place.
www.reranch.com