Not as bad as you may think. The hardest part was getting the old oxidized crap off the lip and spokes. Usually with 80 grit paper (by hand). Once the crap is gone it is not bad. A progression of grits down to 1500 or 2000. Then polish them. Painting the silver is the easy part. A little tape, a razor and then wheel paint. Tape the polished parts, cut to the edge with razor and spray away.
See....another tip I just simply overlooked until you pointed it out. It's subtle, but it makes a difference. I like it. I see these center caps available but they seem pretty pricey! Guess the days of $20 center caps is gone.