I just did A6 middle big DIS replacement couple of days ago. Putting a new one in is a piece of cake, removing the old one is a bit more tricky without damaging ribbon cable.
You do not want to put too much heat in it but at the same time you need enough to melt the solder so that you do not need to pull too hard. I definitely pulled to hard and 2 of traces from ribbon were left on PCB but I did not really care about the old one as it was going in the bin anyway. Odometer and time displays on C5 A6 just use rubber strips. I guess if you have the right tools and are careful it should be OK but it might be easier to remove EEPROM from old and transfer to replacement and that would transfer over your mileage and immo/key data.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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