According to foot expert John Vonhof, author of "Fixing your Feet", you should leave for your camino with your feet as smooth as a baby's bottom.
Forum member and camino guidebook author Dave Whitson (
@Dave) has produced an ongoing series of camino related podcasts. Number 8 in the series features an interview with John Vonhof and is well worth listening to. The part that specifically relates to calluses is around minute 30, but I highly recommend listening to this and all of Dave's podcasts in their entirety. Here is a
link to the podcast on foot care (which also includes a section on the dreaded subject of snoring)
Buen camino!