I firmly believe that gentling is the best training. I've only owned one horse, so im no pro. But my first horse was a 3 year old belgian draught stallion, (im 6'1'' 190 pounds.) with NO training. It was an experience, but I wouldnt trade it for the world. Horses pick up on body language ALOT. You may be sppoking him without knowing it. My big guy became an excellent ride and we had an awesome bond. Go slow, go easy, and learn his quirks, he'll learn yours and youll work better.