You might want to set it up a couple of days before the eggs come so you can have your temperature and humidity stable. It might take a few adjustments before you get it right.
Make sure you have it all set up and regulated before the eggs come(which I'm sure you will). I got a Hobavator for Christmas and couldn't wait to get started! I did about 4 hatches and now they're starting to lay eggs. It makes it all worth while when everything comes full circle. Have fun and...