You need to see not just the basic outline of a lesson. You need to see all the little details that make a difference, and you need to see what happens when something goes wrong. Training is not all smooth sailing. Horses are like toddlers. They have days when they are perfect, and days when they can drive you crazy.
Training is also a matter of balancing opposing requests.
For every behavior you teach, there is an opposite behavior that must be kept in balance. If you teach your horse to stand still, you're also going to need to teach him to move forward. If you teach him to move out, you're going to need to teach him to stop. If you teach him to drop his nose to the ground, you're going to need to teach him to lift it back up. To truly master an exercise you have to bring it into balance with the rest of your horse's training.