I think it's a pretty straight foward way to root. Here's another guide if you want to have another option.
http://android.modaco.com/content/htc-desire-desire-modaco-com/307365/14-jun-r6-riskfreeroot-htc-desire-rooting-guide-now-with-hboot-0-80-and-os-to-1-21-support/
Unrevoked is truly a brain dead method of rooting. I even did Unroked forever on my Incredible. It even makes backing up and switching roms a piece of cake. Thumbs up to them, great job!!!!!
Rooting any phone now day is easy. In the day it was difficult to root the G1. My first G1 in Jan 2009 took a lot of research and several hours to root. My second G1 inJune 2009 took less than 30 minutes. My N1 in Jan 2010 was very easy too.