I did it just recently. It is very easy.
I bought a cheap toaster oven from Walmart for like $25. And I bought a wire mesh basket for about $10. I bought 1 pound of red powder coat from Harbor Freight.
All you do is swish the bullets around in the powder in a tupperware container for a minute, then dump them into the wire mesh basket, so that all the excess powder falls onto a sheet of cardboard underneath. All the extra powder (which is most of it) goes right back into your storage bottle again, minus whatever stuck to the bullets.
Then I use tweesers to set each .45 bullet base down on a sheet of aluminum foil on the baking tray, and then you bake them for like 20 minutes. I forget the temp now.
However, you probably will need to size them after powder coating. Before, I was using Lee Alox (xlox) to tumble-lube them. The problem with the Alox is the lube is all over the nose of the bullet, which then gums up the feed ramp of the gun. So I was individually wiping each bullet nose with a rag dipped in mineral spirits to get it clean. The powder coating eliminates that. But the Alox bullets could be shot as-cast.
It's possible my PC bullets could be shot as cast, also, but I sized them.
And if you are going to size them anyway, you may as well use traditional bullets and lube and size them at the same time (I have a Lyman 4500 Lubrisizer).
I think I'm reloading with about 4.5 grains of Bullseye as I recall. When I did a test, factory Winchester ammo was the most accurate in my Ruger P90, followed by my as-cast Lee Tumble-Lube Trunacted Cone alox bullets, followed by the same bullet powder coated and sized to .452.
Aside from the worst accuracy (with the only load/size I tried), the bullets work fine and are less work than Alox with nose cleaning.
Steve