The thing is, there is only so much that can be explained by an instructor, video, or book in the English language. Beyond that, it comes down to body language, which is difficult or impossible to communicate between people; it is something that each person has to understand for himself. Even when something is communicated perfectly clearly between two people (you're creeping, you're moving your head) it takes a while for the person hearing it to incorporate exactly what those words mean in terms of their own physical awareness before the improvement can be made. Then, after a person learns basic form and is doing everything more or less correctly, it takes a while longer (in my case the rest of my life) and a certain amount of experimentation to determine which among the almost infinite variations in grip, anchor, back tension, rhythm, etc., is best for him.