Finally got around to do mine today. Fairly simple job (turned sort of sour for me).
Hammered out the bit from a 14 mm hex socket. Worked perfectly. Both bolts were on pretty tight. Took some effort. Old fluid was nice and dark. As we tend to say here, lifetime my arse. I have 110k on the car.
During refilling tipped the bottle spilled 300 ml or so but had enough to complete the job.
Without taking chances reset HO integrators via bt tool. Car seems smoother but it may be my imagination. Mostly the same, that's probably a good thing.