Reshared post from +DroidHorizon
Noobs Guide… Root the Nexus7
Stumbled upon this very beginners friendly video whilst looking for drivers to root my Nexus7 last night. (I'm using Windows8, don't ask)
The forum post is http://goo.gl/NfdyP and they will be more than happy to help you.
You know the score as well as me.. Follow the simple video and you'll be fine. If you can't do what the video is showing, maybe don't attempt it? Actually been undecided about rooting myself and decided why not. ;)