Some hints:

- Do not jump too high.
- Use variation. Run in place, skip with both legs, get the knees up, touch your bottom with your feet, etc. Do not jump in the same style all the time.
- Play music. Hiphop works great for me.
- Swing the rope by using your wrist instead of arms, you will be able to keep going much longer.
- Jump in front of a mirror. Look at yourself getting less clumsy over time. This will motivate you.