There are so many guides which are out there for rooting devices and they all seem to be using different methods which can get quite complicated to the people who don't have much knowledge with "hacking" at all.
Well an XDA developer has put together a brilliant toolkit that'll let you do everything from rooting your Nexus 7 to then putting it back to its original state like it's never been hacked. You don't have to type out any commands or anything whatsoever, just a few click here and there, making the procedure as simple and as quick as possible.
Note: This tool is only available for Windows. It'll also work with the Nexus S and Galaxy Nexus.
Just head over here to download the tool.