Mike,
I taught children's and adult art classes for about 10 years, driven by my own enthusiasm and experiences but always apologetic that I wasn't a trained art teacher. Guess what! I went off to university to learn how to do it properly and finished up so involved in the process and outcomes of teaching that I forgot "my drive".
The consensus among my students was that I was much more able to inspire them before I got educated. Go for it. You have a marvelous talent and if you don't pass on your skills, who else will?
There is a website
www.gauvin.com.au where the artist, in her "ARTLIFE" newsletter, has some entertaining stories about "public commentary." Go to the 'Could you use some tips from a master painter' section. She has just updated her webpage so if you have trouble subscribing, email her and she will send you a password.