I have been taking classes for 15 years. I take classes all the time, but I am like you before each one, even if I have taken a class from the instructor before. I'm not sure "Tizz" is fear, excitement, anticipation or whatever. Maybe all of those. I know that I can hardly wait and I think the "Tizz" makes me extra vigilant when I am doing pre-class cutting and sewing. Once I get to the class it is all excitement.