well disagree a bit. I bought a new pair of upper end Burton's. they hurt my feet something fierce. Was able to return them and got a pair of Salomon's. They feel a ton better. Best thing to do is try on a ton and hopefully find a sales person who knows what they are talking about.
My mistake was I wanted Burton's cause they had the smallest profile. that is all I concentrated on. I was wrong.
Find the boot that fits you the best. and with technology today, there is not much need for it to "break in" before it feels good. they should feel good from the start.