Don't forget to pack those extra socks in your fanny pack! Dry feet are happy feet! You will want to change your socks at lunch each day.
Also remember that when you feel a hot spot starting, deal with it right then!
Yes, the medical team is there to help, but you need to be able to treat your blisters as well. :) The Self-Service section at the medical tent is great... lots of moleskin, bandaids, second skin.... it's a walker's paradise! ;)