Hi Centaursam.
I sympathize with your difficulty in finding a good trainer. I searched for 40 years before I finally found the second riding teacher in my life who was willing to go along with me on the path to good riding. Since I have MS this was challenging, especially before my MS was diagnosed & no one had any idea why I could not do stuff, including me.
You do need suitable horses right now. My riding teacher has no difficulty in putting me up on somewhat challenging horses because I’ve ridden horses for over 50 years and during those years I educated myself a lot by training/retraining my own horses and reading equitation books by the “old masters”, so I can handle a lot of stuff that beginners have no idea how to handle. IF I did not have this long experience she would have put me on her “old reliable” lesson horses, and I mean OLD, some are over 30 years old, and super reliable. The horses I get to ride have problems, but I KNOW how to deal with most of these problems. Right now you do not know how to deal with these problems, though with experience you will learn just like I did. I am not a super rider, I am crippled with MS and very limited with what I can do, but what I CAN do I do very well (at least that is what the horses “tell” my riding teacher.) Another thing to consider about lesson horses is that horses do not reach mental maturity until they are “aged”–nine years old or older. Before this age even quiet horses can have episodes of “I don’t wanna do that” or express their irritation with their rider more emphatically than an older lesson horse. You are not qualified yet to train the young horses, that will come later with experience.
A lot of people here may disagree with what I am about to say. Do you want to jump horses? Avoid learning dressage right now. You seem to be having some difficulties with your body trying to find the right balance for jumping, this is curable with more jumping with a reliable horse and a good teacher. It is not curable for most of us adults by switching from jumping balance to a dressage balance constantly. AFTER you have made your jumping secure and effective is the right time to learn the “dressage” methods that can improve your riding between the jumps.
As far as controlling the horse right now concentrate on getting the horse to extend and shorten his stride as you ask him to, but realize that collection has no place in jumping while you are still learning how to jump effectively without abusing the horse. Practice turns, at first big and smooth, and then shorter more abrupt turns. Learn how to do this gently so that the horses will trust your hands, jumping horses especially seem to hate harsh and super busy hands. This will serve you well for many years and the horses you ride will be MUCH happier with you.
All this takes TIME, and there should be slow and steady progress. None of us get it all right off.
While good riding teachers are invaluable, I have found that MOST of what I learn from a lesson comes from the HORSE’S instruction, not my riding teacher. The horses’ reactions to my aids tell me if I got it right or if I got it horribly wrong. Right now it seems to me that the horses are trying to teach you how not to hurt or irritate them, and sometimes the rider has to ignore the riding teacher until the horse says it is comfortable enough to progress again. If there is a disagreement between my riding teacher and my horse about my riding I listen to the HORSE first, which often irritates the riding teacher. My riding teacher has gotten used to it since most the horses I ride improve.
Good luck in your search for the perfect lesson stable for you.