I'm pretty sure that all you need is root to install Xposed but basically here's what you got to do:
For root follow the steps here http://forum.xda-developers.com/show...&postcount=869
Then just go into the play store and find G2 Xposed and download that
Once you open that app it should say you don't have the Xposed framework installed and then it will ask you if you want to install it to which you will say yes (duh) (it will download an apk and you have to manually install it)
Then once the app is installed you will open it. It will tell you to install the framework (or something, i don't recall exactly what I selected)
Install it, and then reboot.
Freedom for your G2
Best of luck. Let me know if you run into any trouble