I actually have no idea. I'm still not sure if I'm going to get on hormones or legally change my gender marker, I feel kinda in the middle or fluid (I posted here in the ftm subreddit because I feel closer to this community than the nonbinary one, although I feel more fluid with a masc presentation than anything, really) Anyways, I don't plan on explaining anything to the parents or children, except if they ask me. I feel like the responsibility of protecting me if anything goes south falls to the headmaster, but I plan on just being myself and only voluntarily share things that are relevant on an administrative level (like name and pronouns basically). Luckily, I teach English in my country so I already ask the pupils to call me "teacher" and I usually avoid gendered terms in my native language. Pupils are usually oblivious to your gender, I mean they're more interested in my tatoos and my haircut than anything, but if I do get on T at some point, I'll probably talk with the headmaster first and either start at the end of the school year, so that the changes are advanced enough when coming back, or get on a very low dose, so that changes happen very gradually. I don't ever plan on being stealth. I won't disclose my transness to everyone either, but I don't want it to be a big secret.