The greatest motivator is to think about the end result. This applies to other will-power consuming objectives like losing weight. You should think about what

The greatest motivator is to think about the end result. This applies to other will-power consuming objectives like losing weight. You should think about what you will achieve in the end. Especially if the side project is one that you can make use of yourself, the effect is even bigger since you will have immediate benefits from the outcome.