Accuracy

When I say ‘accuracy’, what I mean is clean single note playing.

So

Moving laterally between adjacent holes without under/overshooting.

Skipping holes without missing your target.

Moving diagonally from a draw note in one hole to a blow note in another (and reverse)

Navigational aids: tongue, ears, bridges, muscle memory.

Rhythm… reproduce tunes you already know so that self-correction is automatic.

And

Of course remembering that once accuracy is comfortably achieved, tone should be automatically built in!