Congrats on the C wire! I was lucky in my 1950s house that when they installed AC in the 90s they ran a new thermostat wire with the C wire, they just didn't hook it up, so all I had to do was find a power source for it and hook it up in the basement!
I've gotta ask - why a nest thermostat? There are cheaper options out there that you haven't got to de-evil. I use a Honeywell Z Wave unit and it's great.
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