Here you can find instructions for common repairs.
My own instructions and videos shoud be available soon. In the meantime, check what I found on the internet:
BMW E38 E39 E53 Instrument cluster
A great instructable about replacing speedo LCD cable:
A bit different cable is used but it’s the same procedure.
Note this is a DIY method, not a professional one.
A proper way to remove needles:
BMW MID radio
Found on Youtube: