Open up his thread (the one here at AC) and go step by step. You need to install/configure the drivers. If for some reason the fastboot drivers don't work (and trust me, it'll guide you through it--you will know if they don't and you won't harm a thing), you may have to get a bit funky and Google the issue (or check XDA Developers' thread on it). That being said, this is an updated version so that may be completely resolved.
Essentially, you install/configure drivers, then you (1) unlock, then (2) root. You can choose to backup your stuff there, but again I recommend simply sliding stuff over to your computer. Doesn't hurt to be thorough in backing up!