As pjz already said, there is a free demo which you can use to see if you get along with it. You should know that Bodypaint is an application aimed at the professional market, so have a look at the price before you spend too much time learning it. 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.