Is there any way you could postpone the snake?

You might want to give yourself a day or two (or more) to tweak the temperature controllers and gauge the base humidity and the rate that the humidity rises/drops.

This way you're working out the technical details BEFORE you have to worry about an animal, and if it turns out the room is too cold, dry, etc for you to maintain conditions in the enclosure, you'll be able to spot this and fix it before you have to worry about a new snake that's already stressed from arriving and being introduced to a new enclosure.

My 2 cents.