Crazy while cantering at shows

I think my tension has been a problem; someone suggested this to me and at the next show I went to I consciously made sure I was taking deep breaths, especially at transitions, and not rushing anything, and he actually did better. Still fast, but better. Ever since that show he has trotted much, much quiter, but the canter still needs work. I try to think to myself not to be nervous, and it has helped some, but I still find myself tense at times. Ugh!
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