Plain and simple.
Nothing to this guide except:
[Zul'Gurub]
Defeat Hakkar in Zul'Gurub
Do this now.
The reason, is that Zul'Gurub is going to become a leveling zone, so therefore if you did Zul'Gurub before it was unavailable, you will get a FoS.
(Same goes for [Master of Arms] and [Did Somebody Order a Knuckle Sandwich?] -- Changed into a FoS when 4.0.1 was introduced.)