When riding in a lesson, I always try to get my lead changes between the center and quarterline as often as possible. My theory behind this is that by doing it this way, I am actually getting the horse to do the lead change rather then the horse doing it on auto once he gets to the wall. Another girl that I ride with waits to get to the wall before asking.
Is there really a right or wrong to this? When schooling mind you, not at a show.
If I was at a show (hunter) and I got the wrong lead, I would wait until I got into the corner before I fixed it.