I picked up Java as a long yearling and he could be saddled and lounged. I did all the work from there on up. During his five year old year he went for reining training two months, just for sh*ts and giggles. He was the TALLEST horse there at 16 hh, it gave me a good laugh. But he needed to go somewhere that winter (due to hay issues), so instead of just boarding him out at a place I decided that I'd send him there to be worked instead of sitting in somebody's pasture with me only able to get there once a week. He learned how to (kind of) cut buffalo, too. Man, did he come back MUSCLED! We took grand champion that year for Halter Geldings.
Basically everything that horse knows, it's because I taught him. By Java's six year old year we were competing in Halter, Showmanship and Western Pleasure and taking the top of the classes in our Quarter Horse circuit. By his seven year old year, he was taking trail classes, too.
I had a 6 year old Mustang who was supposedly ride-able, but I had to break him out, too. We sold him about two years later, so I wasn't able to accomplish as much with him.