how to come out?

note: i'm sure this situation isn't completely unique, but i couldn't find anything through forums

anyway, i'd like advice on how to come out as transmasc. especially now.

just to clarify, i'd like to mention to her that i want to be called a boy and be referred to with he/him. transmasc doesn't always = trans man, and even then not all trans men go by he/him or even dress what most people would consider masculine.

continuing! i'd like to do it sooner because
1. most people from my previous school aren't going to my new high school. if i'm able to get a binder and appropriate clothes earlier on, my peers likely won't remember what i looked like before, and they'll call me what i want them to (assuming i pass, which i feel like i can.)

2. more time for relatives to get used to the idea. obviously, i'm not sure about the future, but in the case that i move elsewhere or something happens, they'll at the very least know

something i'd like to mention is that this wouldn't be the first time my mom would have heard of this. for the sake of making things short, events lead to mom knowing some of my struggles through me telling them to her. i was telling my mom about stuff happening to me, and something i brought up was wanting to be a boy and wishing i had shorter hair (i didn't explicitly state that i could be trans). that's the only time i brought it up. she said it was just a phase and that it's something i'll grow out of, but then later on she mentioned that i'll always be her child (i could be wrong but she said that she wouldn't hate me if it wasn't a phase),

i'm not really sure what her stance is regarding lgbtq+. i've only heard her listen to a celebrity (? not sure if that's what they were) talk about their experience being gay in one instance. from what i've seen she doesn't pay attention to queer people on tv, which just confuses me further. i'm not sure if she really just doesn't care because she's okay with it or if she doesn't care because she really doesn't care

she still calls me her daughter and everything, but she lets me wear button up shirts/flannels (which are the closest to what i want to wear), and lets me have my hair cut pretty short. the only thing she prevents me from doing is wearing things meant for men, but a lot of the time the pants and shirts don't look too different from what she lets me wear from the women's section. i really feel like she just doesn't let me because it's just the labels on what clothes guys wear

i won't mention what church my family and close relatives go to, but the religion doesn't believe in trans people ?? i think. i think most of the views by everyone in the church are that lgbtq+ is not allowed (i'm not sure about how much of the church reads the magazine, that's why i have to clarify.) i'm really conflicted because of this, because if i come out, i could potentially expel myself and relatives who support. my mom isn't super religious, but she definitely believes in this religion, and i doubt she'd want me out of it. plus, i believe she's in a really tough spot right now since she has a new job, problems with my dad, and other stuff.

also note, my therapist knows about all of this stuff, and i'm sure she calls me mason and uses he/him on me. same for an online friend i have

questions are allowed, i think this is all a bit messy and it's definitely a lot for background information

to anyone who answers, thank you. i appreciate any advice