Join Date: Mar 2009
Location: Washington, USA.
I've only taught riding horses how to drive, not the other way around. But in general, I don't think this is much different from anyone else teaching any other horse something new. Some ground driving will help teach your horse how to respond to rein aids, but if you are confident/capable enough, I would just get on. Do lots of circles, serpentines, and/or squiggly lines/weaving poles, as well as lots of walk, halt, back up transitions to get her responding. For a hard-mouthed horse, I would back up EVERY time I halt to reinforce it, at least until they are responding nicely. Just don't be too gentle. You don't make soft horses by being gentle all the time. Ask with the pressure you want to use, then increase the pressure until you get the result. It's the whole ask, tell, demand system.
"Great spirits have always encountered violent opposition from mediocre minds."