I work in a single sex (girls) secondary school, but we have some trans boys who we use male pronouns for. But the school is a single sex school so I doubt they will ever admit trans girls who are biologically male.
I think that's a pretty clear line and i agree with it; we will call young people the names and pronouns they want, but we operate as a single sex female space so it would be inappropriate for someone who is biologically male to attend the school.
Respecting people's pronouns, whatever I think, for me is not difficult. Allowing people to change their names, hairstyles, uniform too, which I think the most ardently GC people agree on.
I know a psychiatrist socially and he was saying that in his experience it is more damaging to refuse to accept people who are presenting as trans, even if you personally believe they are wrong. I don't know how true that is, and I can see a few opinions on here which say exactly the opposite. Fair enough if you think it is unfair on the rest of the class. I work in a girls' secondary, so it is clear to everyone that the trans boys there were girls when they started school, and they are older so it is probably a little different.