There are alot of guys like me that do it on the side as more of a hobby than a career. I will say that a complete color change is going to be the most expensive option there is. I am doing a 2001 mustang as we speak. It is going from silver to Diamond white tri-coat( color you see on the newer caddys). Paint and supplies was $1000. Labor is another $1200. Basic black single stage paint might run you $250 or $300 for materials and supplies,(bc/cc is more) then another $1200-$1500 for labor, or more if the body is real bad. I have my own 90 mustang gt to repaint and I will say that it is more difficult than the newer models. Primarily because of the way the ground effects and bumpers attach.
You might get lucky and find someone near you that will let you do some of the grunt work and save a few bucks. Stripping the car of all the mouldings, ground effects, bumpers, weather stripping, etc, etc.
Like DMAN said, quality paint jobs are not cheap.
Another example is my next job, a 99 gmc truck, I am charging 700 for it. He has already done all the body work and primed it. He is also supplying all the paint and supplies. Basically all I am doing is sanding the primer, masking, and spraying the bc/cc. And remember, these are jobs for my buddys. A real shop would charge almost double my labor. And the prices I am giving are for southern Louisiana. I have been to NY/NJ, labor is quite a bit more up there.
Good luck getting a decent paint job that is a complete color change and includes body work for $1500