Eugen Herrigel said this quote

...the preparations for working put him simultaneously in the right frame of mind for creating... that collectedness and presence of mind...the right frame of mind for the artist is only reached when the preparing and the creating, the technical and the artistic, the material and the spiritual, the project and the object, flow together without a break.

~ Eugen Herrigel

This exquisite state of unconcerned immersion in oneself is not, unfortunately, of long duration. It is liable to be disturbed from inside. As though sprung from nowhere, moods, feelings, desires, worries and even thoughts incontinently rise up, in a meaningless jumble.... The only successful way of rendering this disturbance inoperative is to keep on breathing quietly and unconcernedly, to enter into friendly relations with whatever appears on the scene, to accustom oneself to it, to look at it equably and at last grow weary of looking.

~ Eugen Herrigel

And what impels him to repeat this process at every single lesson, and, with the same remorseless insistence, to make his pupils copy it without the least alteration? He sticks to this traditional custom because he knows from experience that the preparations for working put him simultaneously in the right frame of mind for creating. The meditative repose in which he performs them gives him that vital loosening and equability of all his powers, that collectedness and presence of mind, without which no right work can be done.

~ Eugen Herrigel

You worry yourself unnecessarily. Put the thought of hitting right out of your mind!

~ Eugen Herrigel