I think that in order to be a successful and fluent horseperson, that you need to realize that one person does not have all the answers, including ourselves. No one trainer is the same, and it has been said -- neither are the horses we work with. A method that is tried and true on one horse holds no guarantee on another... and as imperfect humans, we should realize that there is always room for error and improvement. When one starts thinking that they know it all, they have truly lost their footing and are common to hit the ground faster than he who is humbled by the experience. Don't be a trainer if you cannot read/judge/predict a horse by it's movements. They require someone with patience and a strong will, otherwise you will get either 'dead broke' horses or soured ones.
I know of a person in these parts who advertises themselves as a trainer and taken on some equine clients (a few rusty trail horses and some non-halter trained geldings). When we went to see them, I asked the trainer to show me their 'methods'. Sure enough, there was a huge lack of communication (trainer to horse) and interpretation (horse to trainer). A bit frustrated, I walked up and caught him; touched him all over and walked away. The trainer was absolutely stunned, even when I pointed out the miscommunication. "He doesn't want to be 'bad' or not listen. You're just not effectively telling him what to do, nor praising him for doing it right, so he keeps guessing at what you want." Now, I'm nothing special, but I feel that you do have to focus and be tuned in to be successful with horses....
"I'm no conformation expert, but I do believe that that cow just photobombed her. Twice."
"I don't know.......... looks more like a Quarterhorse to me."