Day 1 - Make sure you can start the thing and get it out to the runway as quickly as possible. This leaves time to practice actually flying the aircraft since most places won't expect too much from you.

Don't get discouraged in the first couple sims. Everything usually comes together around Sim 3 or 4 and after that it's practice. You and your sim partner should be attached at the hip, if possible. That way you can run through flows/callouts pretty much anytime you want. Paper Tigers are good, but it all usually goes out the window on Day 1 cuz you don't see what actually happens. After that they help again. I guess the moral is to use them, but don't go nuts with it before you ever get into the Sim. The SIT/CPT should do a good job of preparing you. Try to stay positive, admit errors, don't make excuses. If your sim instructor see's you trying hard he'll teach you better.