To learn to say no !

I guess one of the very important things that I should learn to do in the coming days is the ability to say no gracefully. You can say that I am a yes man, in fact I was quite proud of it until recently. Being an yes man has been quite a positive thing for me so far, until I continuously ended up hurting my plans by saying yes. And the first time I said a NO, even I felt it kind of being rude and  the other person ended up taking it personal. I think it will take me some time to not to be guilty about it. So just in case I am saying No to you next time, its not anything personal, but its just that I have something else more important to do. I sincerely do hope you would understand.