My lesson plans are good now, tight and thought through. But this morning the whole thing died ten minutes in, thirty blank faces staring back at me. I froze, because I still don't know how to change course in the moment when the plan I made isn't working.
More people experience this than they realize.
You can plan a strong lesson, but rescuing it mid-class when it flops still throws you.
If this sounds familiar, the Library can help you find the bigger picture.