I spent a lot of time trying to master this technique, and no matter how hard I tried I could never get it down. As it turned out, the problem was that a quarter was too small for me, I switched to a dollar coin and had no trouble.
I used to try and do it with a pen in class; never seemed to work too great, I wasn't even good at spinning a pen on top of my hand.
I also tried to learn how to take notes with my left hand. I eventually got decent enough that if I wrote slowly enough it wasn't too different from a lefty's writing, however it took too long to take notes with (plus I started taking notes on a laptop).