What is it? Removing the starter or the alternator? Having done both a number of times during the 6 speed conversion neither is difficult at all. Of course experience counts.
For the starter, you just need a couple of wiggling extensions. Turn the steering wheel all the way to the right, the starter drops off. It is pretty straight forward.
The M60 alternator is a little trickier, but not terribly hard either. Remove the power steering pump pulley. The alternator drops off to the ground.
Like I said, experience counts.
'01 540it, 6/01
'03 325i 5 speed, 9/02
'10 535ix. 9/09
'10 mini 6 speed
'15 mini countryman 6 speed