I just put it in my repair stand with the seatpost in and tape the seatpost so it doesn't get painted. Of course, I built my repair stand out of galvanized steel tubing, so I don't care if I get paint on it.
BUT, you've missed out on the satisfaction of having done it yourself. I feel sorry for you.
No, I know that paint is now my cup of tea, turning out custom spacers on a lathe, heavy duty fooot pegs for friends kids bmx's that suff i can do. Paint or powder coat leave it to my friends that do it.