It is more about doing than practicing. While practice can provide proficiency, doing is much more motivating, more results generating.

More results generating, eh? Check out:
http://www.film.com/film-review/2000/10014244/100/default-review.html

Go for Clip 1.
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This clip has blown the top off of my mind. Limits? We all have our own respective proficiencies--and most of us think we are pretty good at something or other... I know this is only a movie. But just what IS possible?

After viewing the clip, "Do or do not--there is no practice!" (to coin a phrase) I appreciate the full value of what you just said.

In Zen it is called,
"Spontaneous Right Action" ...good stuff...the best.