I waited until it was closer to my surgery date to tell some people. I wanted people to know why I wasnt going to be at work for 4 weeks. I hate rumors and gossip and didnt want people to come to other conclusions during my absence.
I told people that I trusted and knew would pray for me and encourage me well in advance. I sent a mass email explaining the surgery and why I decided to get the surgery. Once people understand your health problems they understand why you would choose this drastic measure. People are more judgemental when they think you are doing it for cosmetic reasons only.
I had some questions from family that weren't aware of my health issues and do not have email. You have to know that you are making the right choice without regrets and apologies in order to face these questions. I know that if I didn't have the surgery I would never have children, would soon be diabetic and would most likely die in the next five years. That revelation alone gave me the confidence to explain my decision and answer the tough questions. Just make sure you ask yourself the tough questions first, or you just aren't ready for this.