Did JK really rattle can his lambo?
All that cash, would have thought he'd have had it done by a pro.
As for doing a car yourself, you need to follow the "KISS" rule:
Keep
It
Simple
Stupid.
Basically, if it looks hard or is a big job, get a pro or
lots of practice.
When I had the GunMetal 106 Whore thing, we took it apart and rubbed it down to metal and sealed with a layer of primer before giving it to a reputable bodyshop to spray.
The whole cost came in at just north of £2000.
£500 on cans may sound cheap but you need to factor in how many cans and how many times you're going to think "Opps. I've just seriously ruined the potential re-sale value on my car!"
Respraying is a waste of money as a modification, you can never get the cost back when it comes to the sale of the vehicle. As others have suggested, Buy Black to get Black