Motor mounts and trans mount are first - because you want the engine in solid position before you install your refurb'd driveshaft. Part of this reinstall is the adjustment of the driveshaft's length. You want the engine solidly tied down before you do this...(!)

You can remove complete driveshaft as one unit, including flexdisks, if you're well-organized. I did it this way, though my exhaust system was out at the time...

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'83 300 SD
'05 E320 4Matic
'06 BMW 530 xi
'68 Triumph TR 250 - The only car I ever loved more than the Mercedes; who needs electricity, anyway? - Damn, why did I sell it?!
'59 Jaguar 3.4 'Le Chat Noir' - Damn, why did I sell it?!

It's difficult to make predictions, especially about the future.
- Niels Bohr