1. Go to
Curse Gaming WotLK Listing
2. Download Pitbull and other needed mods
3. Delete old version of the mods from your \Interface\Addons folder
4. Extract new mods into \Interface\Addons folder
5. Log in
6. find other broken addon's (there will always be some)
7. Update those too
8. ??????
9. Profit
I had to do the above with Pitbull, Cartographer, Prat, Bug Sack/BugGrabber, and countless others, but pretty much everything fell into place.
Only thing I will have to setup manually is my bars since Bartender3 no longer works in favor of Bartender4