Is the following all Ill need to do? Remove the strut nut, remove the three nuts for the mount and then r&r the mount after pushing the strut shaft down far enough to do so?

Having done this job myself, you might want to raise the car some with a floor jack after removing the nuts. This will take some load off the mount and give you more room to maneuver. Makes the job much simpler.

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2000 c280 Sport (looks like an upgrade, feels like a downgrade)
1991 190e 2.3 (sold)