I have noticed a nagging weakness that shows up in a lot of riders. They have an aversion to studying theory.
In every dressage competition test, at every level, in every country, the horse and rider will start and finish the test with a halt. The beginning of the test may read, “A: Enter working trot. X: Halt, Salute. Proceed collected trot.”
I think many people make a big mistake when they initially seek instruction in any field. Whether the person is an adult looking for help for themselves or a parent looking for lesson for a child, the logic usually goes something like this: I'm just testing the waters to see if I really like music lessons.