A lot of people think that as long as the horse is well trained, they can learn a few basics and then just hop on and let the horse do the work. Well-trained horses can quickly become unruly when ridden by someone with poor form. This is why it's important to work with a trainer or riding coach at least periodically, so you can avoid common pitfalls and keep your relationship with your horse healthy and on track. Even Olympic-class riders work with coaches to keep their skills sharp.