Nothing beats firsthand demonstraition. Ask the local shop guys. The best instructions for this knot and most for that matter is Trey Combs' book "Blue Water Fly Fishing".
I find that it helps to get my toes and teeth involved. Big toe holds the loop(after 20 winds). One hand spreads out the loop(forcing the twists to turn). The tough part is guiding the tag down the spinning twists. Phew! Sorry, I can't help.Good luck.
One cast can change your day...maybe your life.