This one is more on the coming out side.
The employer I came out at hosts a development conference. It was a all hands on deck kind of thing when it came around. Well, my hands stayed in my cube. I was about boiling over from detransition and I didn't trust myself to be able to restrain myself, especially if I imbibed some liquid courage.
Later, I began to think my anger and skipping participation were going to be held as black marks against me. So, one day I went over to HR and told her everything. She thanked me for being professional about it and not coming out to everyone at the after party. This got things off on the right foot and we all began to plan for my going full time on the 11th of January which included a nice announcement shindig. How I came out was left to me, and I chose said shindig, and I think it worked really well. Only problem was I couldn't keep up with the congratulations!
I've recently become aware of someone who informed her employer that she is trans and worked as a male until one day, she just started showing up to work on a whim as herself. I don't know how well that is going to work for her over the long haul. I did that kind of thing in Grad School but I was doing research and needed to demonstrate I had familiarity with the trans experience because of a problem getting IRB approval and in the other class I was out in, I was one face in 200+ and I gave those I sat next to a heads up. It was also my other CS class, so some classmates knew I was living as a woman at least some of the time. I still bet I could have handled it better and, as for this other woman, I hope she doesn't get a reputation of being difficult to manage or something that will haunt her.
Work is different than school, and I'm not trying to justify what I did as ok. Rather, I want to put it out there so someone may be wise and learn from what I did. Working with my employer was the easy way. I didn't need their permission, but it was a team effort that I think helped them want to be an ally for me.