I have a homebrew press which has removed about 2 dozen W124/201 ball joints to date.

Its not too bad of a job, it can be tackled anywhere from complete caveman level of literally hammering out the old socket and using a jack to push the new in to DIYing a press to using a MB tool or replaceing the arm.

It all depends on how much time/money you are willing to spend.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)