Hi George,
Observation is a powerful learning tool isn't it? We can learn so much from watching how others perform their duties. This is true whether it is a craft or teaching. I would suggest that as you observe other instructors you have in mind an idea of what you are wanting to see in their performance. I always develop either a written or mental check list of the things I want to be aware of in my observations. I put this list on a 5x7 card and that way I make sure I can make some notes about my observations. By reviewing these notes I can refresh my memory about things I need to do to improve my own delivery.
Also, I would suggest that you might want to jot down a personal improvement plan. Identify your strengths and weaknesses. This way when course come along that will help you where you think you have holes you will know how you need to approach these courses and their content. This will help you to focus on your personal improvement plan and you will know when you are accomplishing the components of it as evidenced by the items on your list.
Good luck with your development.
Gary