I have a Roku Express+ and love it. I am going to be moving and will be using a different TV. What do I need to do to uninstall my Roku from the existing TV and properly set it up on the TV I will be using?
Nothing. It should just work when you plug it into the new TV. Just unplug it and take the HDMI cable, power adapter, and USB cable and you'll be good to go.
... And if in your new house your router uses a different network name (SSID) and/or password than you had before you'll need to connect to your new network.
Settings > Network > Set up connection