Well, I ride this horse in my lessons who picks up a really fast canter on the left rein and is hard to slow. I get nervous now when I pick up his canter so I think he picks up on that an goes faster. No matter when I try and half halt him, it doesn't work. I lose my position and heels and my stirrups. Plus, I get really nervous and sometimes lose control.
Its getting better, but I would really like to learn how to slow and controll him better.