I recently did this job a second time; this time it was on my E60. It's a little different there because the spindle needs to be lowered on the strut but the control arm is pretty much the same.
I ended up using an impact this time and it was a breeze. I used the plug-in electric impact from Harbor Freight; it's pretty weak for an impact but it was plenty to loosen the ball joint nuts. They're not on there that tight, it's just really easy to make the ball joint spin.
I paid something like $35 for the impact and $10 for an impact socket set. Highly recommend it for anyone doing this job.
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