How do you edit the attachments on a WoW model?

[Eggie Poo Poo]

Okay I got some WoW models. The attachments all refer to the left hand on one of them, the atttachments don't sway with the models animation on another, and so on etc. How do you fix them? So he has like, Chest, Origin, Head, Right Hand. Please I really need to know. Please . . .