HI, Planning a 2013 thru and was wondering what level of planning is truly necessary. I have researched gear extensively and feel like I'm in good shape there. However, the logistics of the trail seem overwhelming trying to plan out. Is it possible to just use a good guide book and wing it? I already have decided that I don't intend any prearranged mail drops with exception of swapping out warm/cold gear. What might be some things that I may want to have planned ahead of time if any?