Some members have done it but not yet on this site.
Check out this thread from the OS:
Removing front differential!! - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum
The shop manual is useless.
1) Remove engine (a 20 page process)
2) Turn it over
3) Remove oil pan.
Yea, right. When the customer is paying by the book hour.
The Haynes manual, which I've never owned, may have more of the process that regular people follow.