You can damage paint with any machine if you don't use it properly. If you watch Adam's how to Videos and the Junkman's videos I highly doubt you will damage the paint though.
Adam designed the products around ease of use. I started 6 months ago and I had never touched a Machine Polisher before and my paint looks amazing. I taught myself with the help of the videos I mentioned above.
EDIT: Sorry, for some reason when I came into the thread it didn't show any replies. Obviously what I said has already been said.