I've thought about it some, and I don't guess I'd change a thing.
I've lived a good life, with more than my share of really hard times, but I've also had a lot of fun. Never been rich, but never really wanted to be, either. I've generally managed to earn what I needed with enough left over for some stuff that I wanted; including enough hunts to keep me entertained a good portion of my life.
I'm happy, with a wonderful wife, so life is good.
I guess if I just HAD to change something, there's a bronc or two that I might wouldn't have saddled on that particular day, or maybe a woman here or there I'd have avoided meeting. All in all though, mistakes are our opportunities to learn, and I've learned a lot.