I'm currently not "fully out", I'm only coming out directly to the people that I have the most connection with/deeper relationships with. My parents know and I'm slowly coming out to my friends as I see them (I don't really want to come out via text or online chat if I can help it). The response has been nothing less of supportive thus far. At this point I don't really feel it necessary to tell everyone else I know, because in the end their opinion is going to have little to no impact on my life as I rarely/never see them.
With that said, if anyone approaches me about the topic, I am totally open to talk about it rationally and calmly, and I just had my first experience with that situation with my aunt. I've left the book my therapist wanted me to get, True Selves, on my computer desk for my family to pick up, thumb through, and get accustomed to the thought of trans*. She did just that. We had a very straight-forward and matter-of-fact conversation, and I actually think I prefer this method of coming out. It's almost easier for me to talk about how I feel and explain it when I'm approached about the subject rather than having to start the topic myself.
Though I guess it's called "coming out" because I'm the one that has to put the information out there first, huh?