I use a HF gun for all my powder coating.
I used it for almost all of the powder coating in my
Sega Star Trek Worklog.
It does the job - the hardest thing to locate is a big oven. I use a junked old Household oven that I aquired one from some freinds ... CL might be a good place to find one.
Once you have the oven; it's a matter of getting 220VAC to the oven.
I don't think you can do a coindoor in a toaster oven. Too small.
Don't use your food oven - toxic powder coat smells up the house worse than laser cutting. And you wouldn't want to eat food cooked in it.
For stripping; I almost always use a sandblasting hood which I also picked up from HF.
In a pinch; stubbon Powdercoat which wouldn't come of was stripped chemically with something which eats plastic at Lowes. Then after I had most of the powder gone; I sandblasted the rest off.
The metal does need to be clean of grease; I use MEK to remove finger prints/oil. You do want to make sure there isn't any rust or rust pitting. Sand it flat or it'll show thru anything but textured powder coat.
I usually sandblast the bare metal to give it a texture for the powder to stick thru. Unless your doing mirror chromes or candy; you don't need it "mirror perfect".