Hi Mike: As the designated subject matter expert, we need to be confident in our abilities, and sometimes, have the courage to go forward even if we may feel not totally like an expert. But the student doesn't have to know that. With preparation, we can be enthusiastic, dynamic, and deliberate in our delivery. Sure, there may be weaker traits or attributes that needs improvement, but that doesn't have to interfere with our ability to successfuly lead the class - unless we allow it. Regards, Barry