Pain! (to quote Clubber Lang in Rocky III)
I've been to one of his seminars, but not instructor training. You work:
stretching
different shoots from standing
Once shooting in, trying a submission hold
How to get out of the submission hold, and counter
How to counter the counter...
A small piece gets added onto, then again and again. Then you may start that all over.
Bart Vale is a good instructor, he takes his time, walks around to check on everyone, makes sure to explain the application...
Make sure to take Motrin with you.