In reply to mynyddresident:
I always try 2 or 3 pairs of Anasazi on (of same given size). Often seems a noticeable difference in sizing between pairs. I like many people have a slight difference in size between my feet. Outside very helpful here, even let me take boots from different boxed pairs and rematch. Try to do this on a quiet day when the shop isnt busy.
May not help if there is a large difference in size but worth a try.
Dave