There are several demo's and tutorials on Youtube. Here's one rather long one with a group:
https://www.youtube.com/watch?v=Q8FBGeDqLtU
Edit: Aunt Philly's DVD gets good reviews:
http://www.amazon.com/Aunt-Phillys-D...ws/B00409T3VE/
but her booklets get rather poor reviews. I am intrigued with this idea but, if I wanted to learn, I think I would order the tool and her DVD rather than the booklets.