It will eventually become so automatic you won't realize you're doing it. It's like a piano player who can make the piano do anything they want it to do without even looking at the keyboard. They could probably explain the mechanics of what they do, but they're such a part of the instrument that it would be difficult to explain the thought process and emotions that go into creating the sounds that they create. To listen so analytically that you can discern even the slightest imperfection in the mix and deal with it before someone else notices it. If it fits your style of worship service, to make moves with the house and stage lighting systems that allow them to have a life and breath that matches the worship service.
Excellence requires study and practice.
Lots of it. It's a never-ending assignment, so get used to it. Sensitivity to the Holy Spirit We also need to be sensitive to the Holy Spirit's leading at the moment. This can be as simple as knowing that the guitar player is about to take a solo, without anyone having told you about it. Now, frankly, if they're already planning on it, I'd prefer that someone in the band tell me that the guitar is going to take a solo during the third verse.