Joined: Jan 2009
Posts: 44,049
Likes: 6,249
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
Another approach: Have your local bike shop mechanic mount them just this once. They will stretch, and they'll get easier to dismount and remount.
I'm an expert mechanic, but a couple of years ago, I brought a difficult tire to my LBS, just because.