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 beautiful art design by kiran
by WoolyWondersCrochet
by beading tutorials
by 365SKETCHES
by nadelspiel * Stricken & Häkeln
by Easy Crafts and Lifehacker
by kanchan kaushik