alanv. I think I only learned a few, but important things from, or because of, the TMS. One was how to project my voice. When I was young we met in quite a large Hall, with no Sound System !! I prevailed upon the Congregation to get one, as some just had weak voices, or no ability to project.
When we got a Sound System , I learned the proper use of microphones. So many people turn their head away from it, or are the wrong distance from it etc .The other , vital, thing I learned was, be the Master of your subject. People are always prepared to listen to someone who is the Master of their subject, and is able to tell them something they do not know. This always involved me in extra research outside of JW Literature.
Learning that though is good, if I have to speak now on anything, I do my Homework ! And people can always hear me , microphone or not !