Hehe, sorry Accord, I used no buffer, all done by hand, although I assume a buffer would have helped greatly.
Mark, use the finest sandpaper you can, if there is no or very little progress, then go for something coarser. That saves you putting in even more scratches. I really cant remember what I used, maybe starting off with 1500 would be a happy medium to get the scratches out. Remember, the coarser sandpaper you use, the more work you'll have to do later on to get rid of those tiny scratches you put in.