Good that its not as bad as you thought. My Alpine White was pretty swirled up when I bought it, and I was absolutely floored with how hard the paint was. It ended up taking multiple sessions with MF cutting pads and Griots Fast Correcting Creme with a G15 long throw. Ron suggested a good starting point above for test spot, then gradually increase the aggressiveness of the combination of product and pads until you are getting the result you want. If the paint is anything like mine, you may may end up way more aggressive than you originally thought. This is certainly doable, but might be a pretty major project in terms of time and effort if you are using a porter cable. Certainly not insurmountable, definitely have fun with the process, but this won`t be something you can expect to knock out in a day, or even a weekend if its badly swirled.