Timing:When you have to express.
Savor the fact that when you’ve sold yourself short in the past, you knew that you could probably do better, but you just chose a less-challenging path. But from now on, in the future, start building your self-confidence by simply challenging yourself to do what you know you can accomplish.
Please refer to the book for more details on this activity.
It is all about pushing my limits. If I have confidence in me, then everyone will have trust me as well. Never knew self-confidence is somewhere linked with "selling short".