Step 6: Prime!
You put primer on the car so the regular paint stays on. Pretty straight forward. I used spray paint, since this doesn't really affect the final finish. Rustoleum makes "automotive primer" so I figured that was appropriate. I'm not qualified to give any advice on spraying, other than do it outside and wear a mask so you don't get cancer.
Prepare the surfaceUse some tack cloth and clean off all the loose paint and dust on the car.
Paint!The coat doesn't need to be thick, but it has to cover everything. Spray it on, have fun.
Let the stuff dry...maybe an hour or 2 before you paint a second coat (if it needs it). Let it dry for a day or two.
Sand it!According to my professional car painter neighbor, you should sand the primer before painting on the top coat. Since fresh primer is extremely "soft", you can use 800 or so grit and get a really smooth surface. Be very careful not to sand through the primer though, or you'll have to spray on some more.