Hmmmm
Once you've aimed the shot, once you have completed your pre-shot routine, there is nothing left to do but shoot. Make or miss it, always put your best stroke on the ball.
That takes the pressure off because regardless of the outcome you gave it all you had. If you stroked the way it was meant to be and didn't punch it, baby the shot, didn't drop your elbow, but actually put a GOOD STROKE on it, then you are done. Even if you happend to miss, at least you did it correctly (yes you can miss correctly) and not because you "tightened up"... and now you can assess whether your aiming was a bit off as to why you missed..... versus not having any clue what so ever...... And if you are going to miss you should look good doing it....thus good form and stroke are essential...