Where did you underestimate the trail? What mistakes did you make that others can learn from? The question for all you long time thru hikes and long distance hikers on the A.T. is, "what can you tell the first time hiker about how you underestimated the trail?
Sure we all can say hike your own hike, pack light. I would ask you to respond beyond the obvious. For example, "what section of the trail in the first 30 did you underestimate??" For me it was TRYING TO HIKE from Low Gap to Tray Mountain. I underestimated the difficulty of the climb out of Unicoi Gap to Tray. Should have planned to stop at Blue Mountain.
I am sure you all, even section hikers of the A.T. could give some words of wisdom.