+1 on the heat molding... bath tub/ bucket method works awesome. I have wide feet and wanted a bit of extra room so when I molded mine I wore thick socks.
Like Jo said dunk them in hot water for about 10 mins, put them on and cinch them up tight, I sat down for the first 5 minutes then stomped around the house for like 30. Before I did it I had a hard time getting my feet in... now they slide right in like butter.