I did mine earlier this summer and i wasnt sure how to go about it either. After some minor research, i found a guy that rents them out. $75 for 3 days. I did it in about 2 hours one day, its pretty simple. Just need a heat gun (girlfriends hairdryer on high was enough for me) so the paint does not crack and get rust under the wheel well. The thing is, you must put down a $275 deposit (when i rented 2 months ago, it was a $500 deposit), but that can be done through paypal and your credit cardand is refunded when the roller is retured.
Great guy to deal with, and here is the information if you want to check it out, or visit this website for more info.
www.fenderroller.com The dude i corresponded with was named Shawn Ayres. Nice guy.
Hope this helps man. GL. There is also the very helpful article posted on the homepage for a photographic explanation, which also helped immensely.
-MT