According to the service manual I have it looks like quite a bit of work, it seems to recommend removing the gearbox to do it.
I seem to remember reading somewhere that you might just be able to get away with just dropping the gearbox down rather than removing it though.
I did it the other week on my 5 speed WRX and it was done in about 10 mins but there was easy access to the switch on the side of the box. Looking at the diagram I have the switch on a 6 speed appears to be on top of the box rather than the side.
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