I'm assuming that TWRP is the recommended recovery?
Depends on what software version you have on your G2's carrier version, and the software version you are on. If you're on KitKat 4.4.2, there hasn't been a straight rooting method YET. Devs are still working on that.
In case you are still on JB 4.2.2, you can root via IOroot22. Just search for IOroot22 on xda and oyu will find it. Pretty clear instructions as well.
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