Check Airman and safetypee
Looking through the FD is not literally but means just notice attitude also. Since all we do with FDs is just centre them once they are centred the attention can be shifted to other parameters before moving back. It is just a matter of forming a habit. Pure raw data requires good scan which requires practice but once a pilot develops it shouldn't require much practice to maintain it. The problem is with everything normal you don't need all this so unless you force yourself good habits can get rusty. But many things will only be practiced in the SIM like EFATO, alternate/direct law or high level manual flight.