I actually do headlight restorations on the side for extra cash, I always sand at an angle like this /// and then cross that 90 degrees the other direction when I switch paper (that is if the headlight is even bad enough to be sanded) that is how you are taught to sand most things when you get into autobody to prevent waves. I also use a 3m foam Sanding pad so that there is no worries of your fingers creating pressure points, makes your paper last longer too. Then I follow up with a 3 stage buff with 3" pads (two wool and one foam) then follow up with wax on a fine foam pad. They turn out tread and last a good long while as well. Plus if they don't require major sanding I can normally do a set on the car in under half an hour.
02 Cougar "Hello Cougar" 3L Hybrid, MSDS, Trubendz, Magnaflow, Quaife, Bat Kit, Hello Kitty Exhaust Tip + More
04 Volvo S60R manual
00 Sable LS Premium -Roush Springs, Magnaflow - 97 'Tour SE MTX