Depends on several factors. In painting there are a lot of different degrees in quality.
I've seen guys change the color of their vehicle and they basically delivered a stripped out vehicle to the paint shop (No interior, no engine, all the wiring pulled out, etc.) Then I've seen others that just had the new color sprayed over the old.
It is all going to depend on how much money you want to spend as well as if you want to do any prep work. You're looking at probably $2000 in up to $10,000