I've always said, the coaches I work with fall into three categories...

1. They know so little that they don't know what they don't know. As a result they are way too overconfident and struggle as coaches.

2. They know enough to know what they don't know so they work their asses off to know more and how to convey it to their team and excel as coaches.

3. They know so much and the sport comes so easy to them that they cannot understand how to teach it to their team and struggle as coaches.

Now I have a name for #1 group!