[T.B. Yoits]

Would you set the known field altitude first then the pressure or vice versa?

You check the Field Elevation against the Automatic Terminal Information Service (ATIS) if it's available, to make sure your altimeter is working and within '75 of the ATIS. If it's not, you're likely calling in the A&P to check the altimeter. If it's within '75 feet of the ATIS, you'll later set the altimeter to Field Elevation on engine run up, per your before-takeoff checklist.

[Bonemaker]

Thanks. You know whereof you speak! 9 hours in a 150 in 1969 here.