R.J.
My schedule changed every 3 months when my son was an infant. What I learned with my OWN (insert all babies are different spiel) is that prepping was pointless, but it only took him about a week to adjust to 'reality'.
If I had to be up while he was sleeping it was *awesome*, because I woke, showered, dressed, ate, got all of his gear together so we could be out the door in 2 minutes flat... and then I just changed his diaper while he was sleeping, popped him in his carseat, and walked out the door. If he woke during that process (my son learned to sleep through anything) it was 'Big Smiles' and snuggle and in his carseat with a bottle and out the door ... OR... his babysitter just came while he was sleeping and *I* walked out the door.
It would always take him about a week to 'figure out' the new schedule and adjust himself. With my own son, that meant sleeping while I was gone. When I was gone during the day, but home at night... he slept a lot during the day and was up half the night. When I was gone at night he dropped daytime naps (or shortened them) to be up most of the day.
Prepping was pointless, though (learned that and suffered). But just 'doing it' he had himself sorted in a week or less. A new 'pattern' emerged every 3 months. Clever little bug.