I agree with what ya'll said. In my experience with boats take what you think it will cost and multiply it by at least three. In my opinion if you're paying someone to do it find someone good that has a good name and plenty of references. There's a lot of guys doing work that is sub par and it would be a shame to be reminded of the money you saved (and SPENT) everytime you look at a sag, or the stuff starts flaking off. Painting just the inside is gonna be more expensive than the outside due to all the angles that get faired and sanded. On the other hand a bunch of folks on here have painted there V20s themselves and the job looks pretty good for a DIYer.