Nothing moves except the things that must move

Nothing is tight except the things that must be tight

Learning to (not) move and to (not) be tight correctly is okay. Things don't fall apart by thinking about them

(Very recently) The air starts the sound by essentially blowing the tongue out of the way (I would vote the "mental block" thread to be pinned

Practice to play with the instrument- find the way to blow and set up that lets the instrument sound its best

Teaching by analogy and metaphor seems like a great idea and is very common, but leads to debate and confusion. The more direct and clear teaching language is, the better