I'm doing a 2015 thru-hike and am getting myself physically prepared toward that end, but I want to make sure that by the time I go, I can handle most anything without issue - both so that I can finish in the time I have and so that I can more thoroughly enjoy my experience on the trail. So my question is, what sections of the trail have you guys found most difficult and why? I want to make sure I get myself prepared for all of them (i.e. certain terrains, distances, water availability) by mimicking them here at home (MI).