Hello Anne,
The things you are striving for should be what all instructors should strive for--WAY TO GO!!! A student picks up immediately when you are unprepared. Also, it is always good to "fess up" when you mess up. We are instructors, and we are far from being perferct. When I don't know an answer, I simply say I don't know, but I will find out, and the next day before I begin the lesson, I give the response to the question I was unable to answer previously.
Patricia