Make sure the heat sources and thermostats are in place and running for a few days so you work out all of the kinks with heating.
Pre-treat the enclosure, hides, and paper substrate for mites a day or so before the snake arrives. That gives everything a chance to dry before it's used.
Put the water bowl in the day the snake arrives.
Video the unboxing. Wipe the snake with a damp paper towel as it comes out of the shipping box (to look for mites), then put it away.
If you are having FedEx deliver to your house avoid the temptation to hit F5 on the tracking info every ten minutes. If you are picking up at the hub then be there ten minutes before it opens so you are first in line.