Do I need to perform a reset of sorts if I am switching from Uverse to Xfinity?

Currently I have Uverse set up in access point mode.  I did not have to disable WiFi at initial set up and it has been running extremely smoothly ever since set up.

I am now swtiching to Xfinity for faster speeds. I purchased my own modem (no router capabilities) and will connect one node as the router and the other 2 wirelessly on the other side of the house. Do I need to perform a reset to switch to Xfinity or simply unplug and connect to the new modem? For what it's worth, I plan on keeping the SSID name.

Thanks in advance!