Do the entire rear end in one go. Drop the entire subframe and redo it all. No need to worry about rear end alignment as you can't throw it off that much no matter what.

This can be done in a weekend if you have access to a press. You want to budget a few extra days to do some rust control/ prevention. Also a good time to look at the rear brake lines.

Next tackle front end suspension and steering.

Just keep in mind that redoing the rear / front suspension will cost you about the entire value of the car. Good parts are not cheap! Your car will drive like a dream when done (in a 1990's sort of way)

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2