I'm painting my datsun 210 rustoleum 'black night' or whatever it's sparkly black, and it looks pretty good.
I stripped each panel to bare metal, fixed dents, primered ( on the lower rust prone parts, cold galvenizing spray, then primer, then rubber undercoat, then color coat. ) wet sanded smooth then sprayed the color and wet sanded more.
I've spent way more $$ than a cheap paint shop job, but I know the dents are fixed properly and the rust prone areas treated.
If someone really wants to do it, let em.
the roof, hood, and trunk areas are the hardest in my experience. Having an area without wind probably helps too.