An article from StrengthCoachBlog.com with a number of coaching reflections applicable to any coach:
Mistake #1: Knowing it all.
Mistake #3: Not visiting other coaches
Mistake #11: Copying any programs
Mistake #18: Not taking enough vacation time
Mistake #25: Reading an article like this and thinking it doesn’t apply to you
Look past the strength specific comments, it's worth a read. Many strength & conditioning coaches seem to be prolific writers, perhaps in efforts to differentiate themselves from other coaches, however there is a lot of good coaching material from this field.