U-verse RG + Apple Airport Exteme

I am looking for help setting this up.  I have looked at a number of threads on the topic of using another router with the U-verse RG and know this can be done, but I'm unclear on some of the terms used and how they may or may not apply to me, like DMZ, bridging and so forth.  I just want my internet to work and to not screw up the VNC connection from my phone to one of my computers.

This is what I have: RG with several computers connected via ethernet, several wireless devices (laptops, iPad) connecting via WiFi.

What I want: To have Airport Extreme handle wireless.

Is it as simple as disabling RG Wi-Fi, plugging Airport Extreme into RG, and setting up new WiFi network via Apple's configuration utility?  Or what else do I need to do?

Thank you!