can be easy if careful
First take cover off stat
2) take clear photo showing where all wires go, color, and terminal labels, C, Y2, etc
Look at new stat and make sure you have a terminal that matches every one on old stat.
3) Turn off air handler breaker in panel box.
4) Turn off compressor breaker.
If unsure or unlabeled, turn off all double pole breakers in box. Keep main breaker on for lights.
5) loosen screws on wires, remove old one, mount new one, reattach all wires to idenical terminals.
6) repower all breakers
Viola !
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