Is this a good guide to root and install a custom rom?

I am a total noob when it comes to installing custom rom's as i've failed so many times before with bricking phones and whatnot. But i need to root the shield tablet i got now until i get the replacement in a few days.

So is this a relieable way?: http://www.ibtimes.co.uk/how-root-nv...covery-1481041