If you’ve got prior 135 jet experience, it won’t be much worse than a cakewalk overall. You’ll still need to study and be prepared, i.e. be a professional, but you’ll be fine. Also, if you’re not used to a crew environment, that will take some getting used to. Nothing to stress about overall.

Best tip I can give you is to go home or wherever you want to be during your down time. You’ll have multiple stretches of 5+ days off more than likely. Take some time to yourself. Other than that, showing up to FTDs with your flows memorized will make your life much, much easier. Also, no matter how many times you hear that you need to be working on your memory items, you won’t technically be tested on those until your oral, which won’t happen until after FTDs.