I have tried to fix a flat only once and was unsuccessful.This was at a 'fix-a-flat' clinic.
I was set to ride the Civil War Century, had a flat in the parking lot. The bike mechanic attempted to fix it. It took him forty five minutes and he never did get that tire seated. By that time it was HOT and my heart was no longer in the ride. I settled for a tomato sandwich and lemonade.
The tire was a brand new Bontrager hard case, incredibly stiff and hard to mount. I don't think I'll ever buy those again.
2008 Trek FX 7.2/Terry Cite X
2009 Jamis Aurora/Brooks B-68
2010 Trek FX 7.6 WSD/stock bontrager