First try jumping on the spot with your feet together, don't jump high at all just quickly up and down. Grab a rope and do the generic skip technique with a speed rope, jumping on the spot, feet together, at the same time.

You don't have to jump high, remember that. I've been teaching my friend at at first he was jumping around the joint like a mad man, just relax and take it slowly. It comes quickly to some and slower to others.