How to finish big things: one step at a time.
For me, Mount Everest is a big deal, but certainly something that is possible for me. Other people seem just astounded that I am attempting to tackle it. Like any big goal, a successful marriage, buying a house, becomming supervisor, finishing college, even finishing high school for some, the key is to do it one step at a time. Thinking about the whole project, even 10%, or just 1% of the project sometimes is too overwhelming to be productive.
The concept of taking just one step, in the conext of something like a marathon, that takes me about 27,000 steps, may seem pointless on it's own, but it is the only way to finish.