Well, this is my first crack at a guide for anything hunter related. I figured the 7.2 artifact challenge was a good place to start. It took me the better part of an hour, and about a dozen tries to get this down.
Completing this awards the achievement A Challenging Look and unlocks a new appearance for your artifact weapon, which is Serpentbite for BM.
The solo scenario is called Feltotem's Fall. I'd advise checking out the comments over on Wowhead, as they helped immensely.
Wowhead link:
آی-ویدئو