I bought my Wolverine 1k's from Nordstrom, wore them for awhile, then returned for a new size ... twice! They are usually pretty generous with returns, so you should be ok.
Follow up question, gents: after a thorough sizing escapade—documented sometime earlier in this thread—I settled on a size 9, which seems to fit juuuuust right, even hitting all of the recommended fit qualities outlined in Crane's blog! However, I have fairly flat feet and pronate inward. To be clear, the boots don't hurt my feet—yet—but I picked up some Super Feet black insoles to give me a little more support so I am not constantly rolling into the inside of the shoe, but the insoles make it a little too snug inside to be reasonable.
I saw earlier that Crane's advise against removing the standard leather insole that comes with the shoe, but has anyone done this to accommodate a different insole? Also, this is my first real pair of leather boots, so is it possible that my feet will eventually break in the leather and have them mold more naturally to my foot ... just forgo the insole?