I ordered this dvd from ebay last spring and am able to groom my yorkies myself now. The dvd shows how to do four different cuts and also tells you what supplies you will need and where to buy them. I've saved a lot of money being able to groom them myself. The only downside to the dvd is you can't skip to the haircut you want to do. You can fast forward though.
http://cgi.ebay.com/YORKIE-DOG-groom...QQcmdZViewItem
There was also another grooming yorkie video on ebay but I don't know how good that one is. I hope this helps.