Probably will have to resort to polishing>compounding>wet-sanding depending on the level of damage to the paint. I would say if you're not familiar with any of those techniques, to get a professional detailer to look at it and asses the damage. Forget about professional body-man, many of them aren't detailers (individuals that restore original finishes without painting) and are only experienced in refinishing techniques.

Definitely forget about the 3M stuff... way too abrasive.