I think non-monetary reward is important issue here. Trying to focus not only on smallest but most pleasurable thing if when the result is there is important. It helps to reduce friction to get yourself to get momentum going. Pomodoro is a great way to keep the momentum. Having a realistic checklist with some cool and some less cool things to accomplish for the day has done wonders form my productivity as well.

Remember you've got to treat yourself well while doing work and work will treat you well in return.