It's not terribly hard to unlock and root a Nexus device, but mucking around with ADB simply isn't for everyone. If you want a somewhat more automated rooting experience for your 2013 Nexus 7, there's the Root Toolkit from Mskip. It's available now for all your modding needs.
Mskip is a senior moderator and recognized developer at XDA. He makes it his business to build simple root toolkits for a ton of devices. Now the new Nexus 7 is on that list. Version 1.02 of the toolkit is available for free on XDA and it allows you to unlock, root, backup, restore, push files, install/correct ADB drivers, and more. There is also a donation version with these premium features: auto-updating of the toolkit, 10 quickpick slots, and extra tips and tricks.
The entire process is controlled by selecting various options from a text-only interface. If you can get your Neuxs 7 detected by ADB, you can root the sucker with the Nexus 7 Root Toolkit.