Good post justbelowcap,
The only thing I can add from my experience and also advice from many training captains, is to expect your own flying skills to dip for a short time. A conscientious SFO will not have their flying distracted by managing a flight, but when you are first in the LHS the fact that the buck really does stop with you can mean that you exert much more energy into safe flight management. And that can be to the detriment of the flying. Also you have changed seat so it takes a short while to get used to flying from a different side. It is not something to be worried about as it will very soon disappear.