i apologize if this sounds dumb but i am not a car expert by any stretch of the imagination. I have a old gmc pick up truck that i picked up for a weekend hobby. It has many problems, but the one i would like to address first is the condition of the body. i would like to know the proper order of actions to take in removing the old paint and very minor rust. what grit do i start with and finish with? it has 2 or 3 layers of old paint,primer and who knows what else please if you could help me it would be very much appreciated.(and my weekends could go by smoother).like i said i may sound like a dumb question but i am lost and would really like to do all i can myself after all thats what i bought it for thank you.