...that's how i painted mine...
..removed the backrest, seat and rack..
..sanded everything down...I actually used scotch-brite pad for sanding (all I had handy)
...masked off the floorboard and motor compartment, headlamp, handlebar cowl...etc...
..primed with a GOOD quality spray primer...sanded and primed again...
...then painted with a GOOD quality paint..
..sanded, again, then sprayed on a final coat...
..'course, i went with a semi-gloss nearly flat black, so i wasn't concerned with the shine...