I just spent an hour and a half in the dentist’s chair getting a temporary crown to replace my broken tooth.
It was entirely natural to say to myself, “I’m not tightening my neck…” etc. When I noticed I was curling my toes, I used it with my toes, and when I noticed clenched hands, I thought ” I’m not tightening my hands,” and they released! The neck direction almost always got a release of my shoulders, which I did not realize I was raising!
I have to say recovery is going a lot quicker than when I come home totally exhausted from my usual stiff as a board position in the chair!
I have tried using positive directions in such situations and it never worked for me. I find the negative directions work! They are intuitive and simple and that makes them vastly more useful.