Upgrading home thermostat?


I am looking to upgrade the thermostat in my home from Honeywell Chronotherm T8090 A1056 to the Google Nest Learning thermostat. Is this something that can be doable? If so, how do I remove the plate which reveals the wires connections? One of the weird things about the current thermostat is that even if it is set to 75 degrees, the AC still cools off the house to 71. I don’t have that issue when the heat is on. I suspect the reason for the AC issue is due to the thermostat but could it be something else? Thank you.

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