I actually have plenty of experience prepping and painting - my dad owned a single car autobody shop and taught me the tricks. The quality of the paintjob largely depends on the prep work. Prep, prep, and prep. A lack of patience is the difference between paint that will last 2 years, and paint that will last 20. A few things, one minor, one big: 1. Remove the door sills and pull the carpet back a few inches to avoid unsightly overspray or lines. Will take you 10 minutes. 2. Don't bother sanding to metal. The existing paint and primer will do just fine as your primer. You will likely have to prime edges you accidentally sand through, though. 2. DO A GUIDE COAT AFTER BODYWORK! Unless you are godlike at prepping a car, you WILL find flaws after a proper guide coat. Yes, this will add a good day's work minimum, but it will be worth it. Dust the car nicely with either a graphite pad or from a guide coat rattle can, and do a final criss cross sanding with a large strait block and 400 grit. Any low spots will be revealed by the guide coat. Fix the low spots with either glazing putty or additional sanding, depending on how deep they are, and repeat the guide coat process until it shows up perfect. Good luck!
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