In reply to bensward:
I bought some G2's last week and have been using them, without breaking in, whilst in Cogne. They are actually surprisingly comfortable out of the box, mine are even a whole size smaller than my normal shoe size. They were a little sore in places to start thought a number of long walk-ins haven't helped. No blisters or serious pain.
I would suggest wearing them indoors a few times to soften up the bootie. Otherwise I don't think it's much of an issue.
If you wear them for a few hours at a medium tightness, you will identify any hot spots that you can preemptively tape if needs be.
If you want to be really extreme, you could always soak the booties and mooch around the house in them as they dry to mould/ soften them. But that's probably overkill.
Damn good boot tho!