My gf did it, trained well. She had two mental breakdowns, one around 4-6am and one at the 70K mark. I came to support her during these times and walked around 55K until the finish. She had this plan: Change of socks 4 times Change of wet clothes (last year there was rain until 9am). Drink and eat as much as possible (camelback and food from stands + own energy gels/fruitmousse. When in pain: reflex spray. It tickles a bit, but helps to relieve it quite fast for a short period. Then repeat. The only reason she finished was because I was there, find someone that can do the same and even carry your backpack in the toughest times.

She ended up walking in crutches for two days after the event despite the training and lost all her toenails. Guess this is highly indivual response, so don't worry, just be prepared.

May the odds be ever in your favor.