If you really want it to look good and prepared to spend $$$ on it, you should have it professionally done..

Doing it yourself, is also good.. But in order for it to be as good as those painted in the auto paint shops, you need the right equipment(compressor, spray guns, paint, etc.) which will cost you $$$ too.

Using spray paint from a can may still produce good quality, but I'm concerned of the longvety and quality of finish. The spray paints tend to chip off too quickly.