I had a hard time finding a tutorial on how to do this, and found a little bit different way. If you do it this way you don't have to change the directions you twist the yarn in order to keep it from getting all twisted up.
by Ladies Tailor
by Hectanooga1 - Crochet, Knitting,
by Drawing Cartoons - How To Draw
by Happy Drawings
by Daniel Miller
by Rajni's Craftivity
by Draw So Cute