The problems are the same over and over and over again. The ONLY difference is the individuals involved. For the most part, horses are horses. Sure, there are individual personalities but they have rather consistent characteristics. Well, horses have a nature as well.
Horses rear for a relatively small number of reasons.
Horses buck for a relatively small number of reasons. Horses bite for a relatively small number of reasons. Horses bolt for a relatively small number of reasons. And so it goes. Eliminate the reasons and the problem stops.