i agree with zach. You can get an econo paint job on sale for close to what you can buy paint, thinner, hardener, etc. The key is you need to do all the prep work such as fixing dings and stuff. Primer is not necessary except where you do repairs and the spray can stuff is fine.
I set up my garage to paint my vw and it came out good. It took a lot of work to convert it into a paint booth, though.