One technique I use is to think about how I would tackle a task if I were to do it. So you start to break it down, think about the first step, and what would follow. Pretty soon what was an really objectionable undertaking seems achievable and I launch into it.
Yes, there are, but what nhangen is saying is very important - what if someone is in a totally wrong place (for himself), but tricked himself to be motivated to work on something which ultimately doesn't bring him happiness or fulfillment?
If you have to "#11: Reward yourself. Often.", isn't it an indicator that the intrinsic reward is lacking in the activity? Then why trick oneself to spend time on it?
However, we are human, and the most suitable work for an individual is still work, parts will be more painful than others. It's these parts where there can be, let's call them "disciplines" that will help.