I am not sure what webinar you mean, but if you are talking about the one that is presented by John Auvil, even though I have not seen it, I have looked at the introductory video, and I would suggest that this might be a good webinar for you to attend. John is an excellent presenter, and he really knows MEP, so if you want to learn more about the application, it could well be worth your time.
From what I saw in the introduction, he will be covering most of the topics in a training video that used to be available to purchase, so what have you got to loose?