I just set that up last night. I attempted to play with two instances of WOW running yesterday figuring how hard could it be. Well I'll tell you that did not work well at all. Constantly switching screens and keeping track of the /follow command without the advice contained on this site was mind boggling. It took me an hour to hit level 5 haha! I look forward to following the guides here and I think after I get the hang of it I'll enjoy this very much.