Learning to say NO

Just finished reading the book "Learning to say NO". The book was quite well and very remarkable and everyone who has a habit of saying 'Yes' to everything should read it once. Important points of the book are written below:-

1. You find yourself constantly saying yes because of that deep-rooted sense of having to be polite, to reciprocate favors and to get along with others.
2. You say yes because you want to be liked by all.
3. You are worrying about what others will think of you.
4. Flattery doesn't always come from the heart.
5. You say yes because you do not want to challenge authority.
6. You say yes because you feel you have to say yes.
7. Sometimes in an effort to always do what is right, people can get caught up in the loop of always saying 'Yes'.
8. You are not assertive enough to muster up the courage to say No.
9. Learning how to say No will make you feel more confident and in control of your life.
10. Sometimes, the accumulation of small issues creates a big one.