Technical facility is only developed with repetition, sometimes massive amounts of repetition. And here lies the problem. It is very easy to let the mind wander far afield as we slug through the 20th or 30th repetition of some passage. On a certain level mechanical facility is only arrived at when conscious control has faded far into the back ground. A certain degree of “mindlessness” is our goal. But this is not a time for day dreaming, but rather a stepping back and becoming mindful of a higher level of activity. As mastery is achieved incrementally, you become aware of a larger context. You fit the details into the larger context of the phrase or series of phrases.