Have your travel info handy (airline info, flight numbers, passport numbers, etc). Also have a credit card number handy to put in as well. I hate scrambling for that info at midnight.
Also, no matter how many times I tell myself to relax prior to the checkin I always get stressed ...and then feel foolish afterwards
The actually selecting of a boarding time might be a few hours after midnight so go directly to the hard to get things first (Palo brunch, Palo dinner, then excursions). Even if there is nothing available for Palo, don't panic as you can try again once you board
Good luck