This video - http://www.youtube.com/watch?v=-XUFV...ature=youtu.be from this thread - Trouble changing tire

Important to put one side of the bead on the rim entirely, and then begin with the other side.

This is one of the best videos I have seen for getting a tire back on the rim without having to use tire irons.

The part about partially inflating the tire before putting it on the rim is good advice, as is the part where he wiggles the valve a little just to make sure nothing is pinched.