Yromulus, I agree with the others regarding the method: but it is still a very fiddly and time consuming operation, with lots of failed attempts on the way. After my first servicing the garage refitted the seat at normal height, so I guess even the professionals have trouble with it. Given that they also fitted the panniers etc and my driveway is on a steep slope I was in a potentially dangerous situation when I tried to get off - not amused! My seat is on the low setting again and I will be in no rush to take it off in the future. It doesn't look as good on the low setting, but it makes everything a lot more practical.
Chris