Keith_Beef
Novice equestrian, accomplished equichetrian
For me, the key to being a really good instructor is being a good communicator (listening as well as explaining) - there are lots of people who can ride very well but can't always communicate exactly what they are doing, or maybe they aren't quite aware of how they produce the results they do!
Not only in horse riding, but in every field: there are plenty of people who are very good at what they do, but cannot explain to other people how to improve.
I have a friend who did his military service in an alpine regiment and is a really good skier. My first time skiing was cross-country with a group of friends including my now OH and him, and everybody could ski except for me. All he could do is say "watch what I do, and do the same". I could not see at all what he was doing in order to turn corners... in the end, I planted the tips of both skis into a bank, fell over sideways and broke two bones in my hand.