Yea it is easy. Do it with Plasti dip (if you don't like it, it comes right off.
Probably will need about 4 cans for all 4 wheels, since you are going to want a couple of coats per rim (the more coats put on, the easier it is to remove)
Just do it on a day that you are free, remove the wheels, tape up where you don't want black and begin to plasti dip.
You can pick up plasti dip at Lowes or home depot.
Go to dipyourcar.com and YouTube for help with plasti dip as well.
Plasti dip is a blast! I did my trashcan in my room and it looks great! Also a few things on my car but there is more to come.
Any questions feel free to ask, that's why we are here.