My observation is that in both cases it is two steps process:

1. You use conscious part of your mind to slowly doing isolated drills with good control and understanding of every detail. On this step conscious part controls process and unconscious part of mind is being trained by observing the drill and outcome.

2. unconscious part of mind is now trained, and you can disable conscious part which will make result better, because unconscious part is better in contoling motor functions.