I can confirm the advice of everyone else.  Order one full size smaller and it will fit.  Initially it is difficult to get on my foot, but not that bad.  I imagine over time it will get much easier.

Update:  This boot is super tight on the top of your foot but lets your heel slip and slide around.  I didn't think too much of it at first (I assumed it was suppossed to fit like that) but it ends up screwing up your socks and they get lumps in them while you wear them, very annoying.  I ended up returning them.