Home Technology Switching WiFi

I'm finally replacing my old Airport Express (2nd Gen) as the only wireless base station in my house and moving to a mesh network system. I'm sure setting up a new network will be easy, but dealing with the countless smart home things (smart plugs, Amazon Echos, Ring Doorbell) and moving them over to the new network seems like a daunting task.

Does anyone have any recommendations for how do do this the easiest? My gut tells me to leave the old wifi network up and live so I can continue to communicate with the smart home stuff while I'm moving it over. Any do this recently and have some tips?

 

Thanks. Such a simple solution and it worked like a charm.