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You're right, one doesn't need to removed ALL the glue, just enough to allow the new glue to be apply.
Secondly, when stretching the tub, usually best to put it on an old clincher rims and let it sit at high pressure, allowing the tub to stretch a bit making installation easier.
There's a whole topic on tubular on this forum, if you're in London, the London Cycle Workshop glue tubular quite regularly last I work there (one or twice a weeks), mainly due to being a Zipp dealership as well as doing track wheels.
edscoble
So I eventually I bought my vittoria open corsas and attempted to glue them to my wheel. My thinking was to coat the wheel twice with glue and the tire once (having stretched them tire) and to try to fit the tire when the second coat of glue on the rim was wet.
I don't think my stretching was sufficient as when I had to place the tires onto the rim I was really struggling to get the tread of the tire to not be in contact with the glue on the rim and to get the tire the whole way round.
I'd heard of people finding them easy enough to change on the side of the road so I clearly I wasn't doing it right...
Fed up of the tires I then took it to the LBS thinking that I'd practice gluing tubs on some less expensive wheels and tires when I could. It took them a full three longer than they had said, as they were removing glue and at the end came out at £50? I kind of felt mugged off, is that a going price? (though I was more mugged off due to the fact that every week they said they'd need another week and then didn't even email me to tell me it wasn't ready)
They said there was a lot of glue to remove and I am now thinking that they were removing all of the pale beige stuff on the rim (some glue from the Japanese keirin I guess) which I thought wasn't entirely necessary if it were smooth/without anything that would obviously make it hard to place the tire onto.
you can kind of see it in the second picture (should have taken some more specific pictures of it) on the front wheel. But anyway, the wheels were released to me and I went out to get a few pictures or so showing the first properly rideable state of the bike after a full on year pretty much.