Another thing I took away from Zen/Archery, and learning to play pool at a hi level, and martial arts study was to simply immerse yourself in the process without looking to a result. The quality of the result will be a product of your immersion of the process or practice while being aware of what is happening. As an example, when trying to shoot a difficult angle on the object ball, I take in what needs to be done (angle, how hard to shoot, etc.) then I concentrate on the process needs to be followed to do what I wish -exclusively. This eliminates the tensions caused by thinking ‘if I miss I’ll lose x $’ or my friends will think I suck, or whatever takes your mind off of accomplishing your task. I also believe these thought can also be a cause of tension. So I just concentrate on the process and take their money.