I've tried TouchPads, trackballs, and various mice. After 20 years of computing, here are four things that I recommend to everyone:
1. Learn how to type by touch. It isn't difficult.
2. Reduce your clicks: use X-mouse focussing. (If you use Windows, install Microsoft's TweakUI Powertoy. If you use X, you have the setting somewhere.)
3. Keep your forearms flat on your desk. Adjust your chair's height if you must.
4. Use a REAL ergonomic keyboard, one with the split-key design. (Any keyboard that does not have the split-key design is ~not~ ergonomic.)