Regarding the difficult class: First of all, roving between three schools
must be very difficult. You have to have a sense of the "school culture" in
the place where you teach. You must "feel" like a substitute, so that's
reflecting on the kids. That's a very difficult way to teach, lugging
supplies and dashing from school to school. It's more the teaching situation
than anything else. Also, first year teaching is extremely difficult. That's
why there is such a high attrition rate among teachers in their first three
years. In many ways first year teaching art is just survival.
Preserving a sense of humor helps. I know that sounds innocous, even
stupid, but if you can find the humor in situations it helps get you through
the day. Remember, it's not you, it's the teaching situation that you're in.
The hardest classes make you a better teacher (if you can survive) because
you learn from this. Believe me, I've been there.
Dennis in Stockton, CA