Edward W. Smith, motivational speaker, author and TV show host, who specializes in quick tips on how to move your life ahead even faster, offers the following advice. The secret to starting something when you don't feel like it, is using what he calls the "Act As If" technique.
With this technique, you act as if you feel like doing something, even though you don't. You go through the motions of doing what you are avoiding, and act happy and excited about doing it.
You exaggerate your feelings on the positive side, while you are beginning to perform the task. Your body "fools" your mind into thinking you really want to do the task, and your mind changes itself into a positive view about the project. This works on basic mood changes as well.
If you are in a bad mood and want to be in a good mood, you would stand up, march around the room with your head high, smiling, signing and acting happy. Within 3 minutes you really will be in a good mood.
So, try it out for yourself. What do you have to lose?