I did train both of mine myself but it was a very different experience with both of them. Koda was as easy as any stock horse I have ever trained. Dobe, on the other hand, was extremely reactive and had a very high flight reflex. For the first year I rode him, I had to be very aware and careful at all times because if he saw something that scared him even a little, he would spin and bolt. Not to the point where he wouldn't stop, I could get him shut down immediately, but that was always his first instinct, to turn and run. I can imagine that most mustangs are just like most stock horses, there are some that take to training like it's the easiest thing in the world and there are some that are challenging as all get-out.