Although I've definitely made mistakes in my horse life, for the most part those mistakes led me to where I am at now so I have very few real regrets. I believe that things happen for a reason. If some things hadn't gone wrong I wouldn't have ever been pushed in the direction that I was, nor would I be where I'm at now. That being said, hindsight is definitely 20/20 and there are things that cross my mind when this comes up.
The fist thing I would love a "do-over" for would be the time spent working with horses that were not going to do the job I wanted them to do. I would have taken the hint much more quickly and I definitely wouldn't have felt so bad about "giving up" on them.
The second thing would be that I'd love to have the 11 year old Roz back. I often think of all of the awesome things Roz and I could have done together "if I knew then what I know now." We could have definitely made it much further in both dressage and eventing. He's got great gaits and a good brain. Even still, he came in to my life at a time when my confidence really needed him and he's been an awesome horse for me.
The younger version of Roz and I.