Limited WillPower
At the beginning of every task we get psych out.
We get excited how we are going to start and finish it.
We make decision while our willpower is full and we always underestimate the process and the time required to finish any task.
The bad news is we all have limited amount of willpower.
Once it is drained, it is gone for a while.
There is a limited supply of willpower, so use it on the most important task and nothing else.