Great question — answering as the UphillTech team:
The main motivation for most people will be that they have done it, that they completed something that seemed very hard to impossible. If that is not enough to motivate you, you will have to look for things that motivate you, personally. That can be that you reward yourself when, and only when you have finished. Maybe you can find other rewards. It can also be the satisfaction of having helped your friend to accomplish the trail. On the other hand, it can be that there is no way to motivate you other than starting and going on, hoping you get the hunger to finish while on the way.
Full answer by Willeke: https://outdoors.stackexchange.com/a/28728 (CC BY-SA 4.0).
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