I just used flat black automotive paint from Wal-Mart and then cleared the parts. The clear does give them a gloss black affect, so if you don't want gloss, don't clear them.
The main thing is take them off the car, sand them down smooth and then make sure they are clean before painting them. I use some prep solvent and wipe them down or a tack cloth to make sure the dust is gone from sanding.
When painting, take your time. Beware of runs or that will set you back some time on the project waiting for it to dry and sand out again.
If you have remote side mirrors, you may have to take off the door panels to get to the connections. The last time I did mine, I spliced in a new connector so I wouldn't have to.
Its really just basic spray painting, prep work, then back and forth spraying, 3 or 4 coats, drying between each coat.