Toddnick,
I had major blister issues on that Chief Logpole hike that terrorized me for the rest of the week. This year I made sure my boots were broken in and ready (bought them last November
). I even wore them to the gym for the tread mill and stair climber. It's the only place I can get an incline liiving here in flat Florida. I thought I was good to go until a month before the trip when I brought my pack, loaded to 27 pounds, to the gym. The load on the inclined treadmill changed everything giving me a large heel blister.
Point to the story: Don't wait for a blister to do your heels in moleskin. Every morning of our July trip started with doing both heels in mole skin. Also, if you have any large, thick calluses, you might want to cut/file them down. When my feet would get real damp, the calluses would pull at the skin around and below them. One caused a small blister that would have gotten worse if I didn't stop, dry off, wrap it in mole skin, and change to a dry pair of socks.
It's that whole "ounce of provention" thing.