Once you take the wheel/s off it all becomes a lot easier and providing you take plenty of care with the masking up you'll be pretty thrilled with the result.I have just bought a set of new (second hand) wheels that need repairs and I"m sort of looking forward to doing them.Just a hint.When you've finished masking up the tyre,take a really small artist's paint brush and carefully paint a little grease or petroleum jelly between the tape and the tyre,under the edge of the rim.This will ensure that absolutely no paint will end up having to be removed from the tyre when the job's completed.Go for it.