Re: relaxing during technique - how?
I remember sugano sensei telling us in a seminar something to the effect that once you tell someone to relax, they can't, because they end up just thinking about that. So maybe don't think about relaxing. Think about just moving.
And like everyone else said, breathe. If you hold your breath and start to muscle through everything, you'll be tanked in no time. I think we've all been there.