Is that a medical opinion Taz?
45 days in Africa? Sounds great! Where abouts is she heading?
Feel free to pass on my email address Chap, it's always a pleasure to help out when I can. Surgical spirit applied to the skin a couple of times a day for as long as possible before she goes will help, but more importantly, make sure that the boots fit, she wears good quality socks (and keeps them clean! Several pairs and change them frequently throughout the day to make sure that her feel stay dry - wet feet are soft and skin tears), cleans her feet at the end of the day and dries them properly.
Being totally blunt though, it's more about hardening the mind than the feet! Accept thay you are probably going to get blisters, accept that they're going to hurt, accept that the treatment is painful - but know that it's only 45 days, and it's NOT going to kill you!
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Just
Justin
www.lastgreatchallenge.com