I was surprised when I first came out to my sister, I always thought she'd be in my corner from day one since she watched a lot of LGBT programing on tv. She hated my guts for months and vowed to make my transition so awful that I'd decide not to do it. She followed through with that decree but I never relented in my choice to transition or to still love her no matter what awful disgusting thing's she'd say to me.
When I came out at work I was VERY surprised by the positive reaction I got from most people. My boss is my biggest ally and has my back because he does not want to lose me as an employee since I do a very very good job. He gave me the best compliment ever when we told the plant manager & hr manager about my impending transition. He said that "we have to do the best we absolutely can to help her smoothly transition at work because if she decides to quit because of harassment then his department will go under" that almost brought me to tears to see how much he valued me as a person and using the right pronouns when I was still in guy mode.
When the announcement was finally made that I'd be transitioning at work NOBODY saw it coming even though at that point I was very close to having an A cup, my beard was pretty much gone, I had lost a lot of weight, gotten out of the bad funk I had been in for a long time, and suddenly it appeared if time was in reverse for me as I started looking younger and younger. The reaction of a few people when I told them to really look me up and down was priceless, you could see them suddenly realize that yeah I'm a girl lol.
My first day of being at work full time was another great experience. There actually were people who introduced themselves thinking this was the first time we had met.