Paint Society on YouTube.
I never painted with automotive paint until a few years ago, now it's fun to do every so often. In fact, my front bumper has rock chips in it again. I went out and bought a bumper that an auto shop ordered incorrectly and painted. I'll paint it so when I want to replace mine, I can easily swap it out, and then paint mine at a later date. No down time! I might even do PPF.
So far, mirror cabs, door handles, platinum applique, and the front bumper.
This is the gun I have and it works fine for smaller stuff. I've shot primer, base, and clear out of it.
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Oops, just read that you are talking about furniture, etc.