If you are not fixing any dents with bondo you might be ok. Get 400 grit sandpaper and sanding blocks in three sizes. small about 2X4" for tight areas. then a 3X5" block and if you can a longer one for the flat door areas. The blocks have to have a perfect true and smooth surface. Keep water flowing and make sure not the slightest dirt gets between the sand paper and the paint...sand away until light scratches are gone and paint is dulled. For the edges get a foam pad that has a fine 400 grit sanding surface for edges, grooves and the like. After it had been sanded wrap every thing up because any little scratch will show up. The Paint shop will degrease and tack rag before painting. Oh yes, when sanding use a circular motion and do not over sand if you start burning through the clear coat into the base coat (color layer) you'll have to spray with primer and re-sand. Good Luck. Where do I apply for the President of Iraq position?