Ugh, oh my god, don't get me started.
My friends are supportive, but they don't really understand it completely, sometimes. To answer your question, it's totally reasonable to be out in some close circles, and not out yet to people you just meet, or people you're not as close with.
Anyway, I agreed to help my friend out with the sound on his short film he was shooting a couple months ago. I was (and still am) close with him, but I didn't know any of the actors he brought along to shoot with. Before going along, he asks me via message what name he should refer to me as around the actors, and I tell him the unisex name I usually go by to people I'm not out around. Coincidentally, the next day in a completely unrelated conversation, I mention to my friends that I'm considering a name to go by, and I might go by that to people I'm out to.
So I go over to the hotel room he rented to do the filming, and introduce myself as [unisex name]. We carry on with the filming, and it's going fine, but then, halfway through, he says to me "Y'know, it's really awkward, because before you came, I told them your name was [male name I was considering]"
And then I realise why, even though I talked in depth with the actors, that they hadn't referred to me by name at all during the filming sessions. Or used any specific pronouns, I also realised. He basically told them I was trans, and without even consulting me or warning me that he did.
Needless to say, I was a little peeved, but it was an honest mistake. My general rule of thumb (at least, up until I got on T) was to introduce myself with the unisex name to people and let them just use whatever pronouns they assumed I went by (which unfortunately, was, and still is, female 99% of the time). I don't like telling people I hardly know that I'm trans, especially when I'm visibly not passing.