there is an enormous difference between a $50 and $500 gun, and while hte gun is not mandatory, the better it is the easier it will be for a newbie.

if you do it in a garage, spray the area out with the air hose, and take great care to put plastic around the car, get those temporary walls if you can afford them, or at least staple them to the walls.

the thing is, when you start spraying paint, its an air line, high pressure, all it does is kick up any dust that was laying around, so you need to be very mindful of dust, because it will stand out the worst when youre done.