I would wait a bit longer, atleast a week, before attempting this. This will give the paint plenty of time to cure, and you won't have to worry about burning it as much. After this is done, start with 1000 grit paper, and warm soapy water. Gently sand in one direction, keeping the paper nice and wet. DO NOT use alot of pressure, and be extra careful around edges, as they tend to naturally have less paint on them. Keep a towel handy to dry off your work, and check your progress. You do not want to sand through the clear coat, so if you start to see anything but white on the sandpaper, you have gone too far. This is up to the painter if he applied a nice heavy clear coat. If your trying to remove orange peel, sand a little, then check your progress. You will be there when it is uniformly dull, no shiny spots. Stop here. Wipe it all down, then gently sand with 1500 grit, untill you cannot see any tiny sanding marks. Once this is done, I use a heavy cut compound to restore some shine, buffing it all over once, then move to a lighter polishing compound to put on a real shine. On black, I then follow with a gloss glaze to remove sanding scratches and reduce spiderwebs. After a month, I apply a hand carnuba wax, when the paint has thoroughly cured. Be sure to check and see what type of paint was used, and its cure time, before starting!