Everybody else covered “use the right name and pronouns” and that is definitely number 1 for keeping your child a pet of your life. Also, correct other’s when they use the wrong name or pronouns. It is exhausting early on to have to do it yourself. IMO, it is even more important to correct people when your child is not present to defend themselves. I’m a long ways into my transition, but the thought of someone misgendering me behind my back makes my blood boil because there isn’t a soul on this earth with the guts to do it to my face.

The main thing I wanted to comment on is how you phrased it. It is so awesome that at 22 your kid TOLD you this was going to be happening. Didn’t ask. Didn’t start talking about it to have you help them make the decision. They are so confident, independent, and felt safe enough talking to you that way at 22 that they told you what they need and what they’re going to do. That’s really admirable. At 22, I had been living in my own for a couple years but my parents still had a lot of unhealthy control over me. I think it would have been like 26 at the earliest when I would have been able to do something like that.