Edblevi,
The stuff Brownells sells isn't too hard to use. I refinished a 1911 with one of their spray cans. As many people have said here before, the spray cans are a little heavy on the spray. An airbrush would give a finer and more easily controlled spray, but the cans do work.
As for actually using the stuff just follow the directions on the can. Bead/sand blast, clean with degreaser, heat parts, spray and back. DO NOT try spraying this stuff indoors, unless you already have a paint booth setup. Once the parts have been sprayed the smell and fumes aren't bad. And you can get away with using the kitchen oven if your parts will fit. I did this one night when the wife was gone. The next day she had no idea.
I don't believe the durability of the do it yourself sprays is anywhere near that of the professional sprays. After about 10 presentations from a holster the finish was rubbing off on my handgun. However, for $25 it works for me, until I can have it redone by a pro.
Hope this helps.
Scott