From claraball:
My recommendation to anyone on a course who is concerned about a trainer or a checker is to play any card you have to to make a change. It's your course. There are no rewards for grinning and bearing it. I speak from experience.
Absolutely, 100% AGREE!
I made it through, but only just, and it would have been very different had I gone with my gut feeling and asked for a change. I thought I was "man- enough" to deal with his pettiness and insistance on non-SOP calls. I was wrong and it cost me some time and a lot of heart-ache. He has gone now, thankfully.