Can I replace this old Trane thermostat with a Nest? (DIY)

[JumeirahJames]

Hi, I have these old Trane thermostats dotted around my house. See pics.

Can I do much with these wires and attach a Nest? Or would this need a professional overhaul?

Thanks!

[Jake]

Hey JumeirahJames,

Sorry for the late reply. I wanted to follow up and ensure you are good to go. Please let me know if you still have any questions from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Jake]

Hey JumeirahJames,

It has been a few days since the last reply, and I am going to lock the thread at this time. If you have any questions, please feel free to create a new post. 

Best regards,
Jake