yeah, had scratchs on a work van and just buffed them, I had to buff the entire van as it looked really bright on one side and dull on the other. I used a medium grade compound and buffed. After that I got a litte paint brush and repainted the scratchs, looked ok. Had to do it all again a year later though!
I used a buffing machine, don't know the name of it. It is electric and looks like an angle grinder, but instead of a cutting blade is a cirular pad that revolves very quickly. I added the compound stairght on to it. Then I just painted the scraths with a little paint brush.
Ok, this is a bit OT - but this guy lists out the buffing machine that he uses. (just might be a bit OTT for what you want )
To clean up the car, 32 hours of polishing and 55 hours of work in total. If you plan to get started on Friday evening, you might get finished up for Monday.