Blisters are no fun.

I speak from experience.

I elaborate on the why over at my germany-blog, but I have a terrible blister on my left foot's biggest toe. It is no fun.

That being said, prepare for a "gross" subject.

[ http://en.wikipedia.org/wiki/Blister ]
[ http://www.thewalkingsite.com/blisters.html ]

I'm thinking that rotating shoes and dealing with uncomfortable things early is probably the best idea.

Still: ewwwwwwwww.