The process is pretty simple.
You have to remove the clear coat, for me I found it easiest to just sand the center section with 220 on an Orbital sander and use aircraft stripper on the outer rim/lip. I used a 3M Maroon pad on a drill to get the lip stripped off if there were any areas left.
Then sand the Aluminum, 400 grit, 800grit, 1000 grit wet and 2000 grit wet. After that I use one of those polishing kits for a drill that can be bought at Harbor Frieght...brown bar then the white. Use some Mother's paste by hand to finish it off.