I play competitive tennis and I have a coach. I had a lesson today and it reminded me of a parallel between tennis and trading.
In tennis one has several shot types, which are equivalent to setups in trading. We have the forehand, the backhand, the volley, the half-volley, the drop shot, the lob and the overhead smash. Seven basic shots. The critical thing is to hit each one the same way, each time.
That means we have to trust the bio-mechanics of the shot. If we fiddle around with it because we are off balance, then we lose our advantage. My coach advises not to focus on the result of the shot, as long as the mechanics are correct.
In trading, we need to practice our setups in SIM and then trust them in live trading. If, after a loss, we try to adjust them on the fly in live trading, we lose our edge.