I need to fix some leaks in my 116 - Are any of these DIY's for a patient novice with tools and a hydraulic lift ?

Rear differential
Transmission (would also swap out filter)
Power steering

I understand these are hard to diagnose, but do they usually involve simply draining, replacing seals, and filling?

Also, was told I need to replace the driveshaft center support.
Is this something a novice can tackle ?

Thanks for all help and assistance!

Bruce