TLDR: is there any way to know how much breast growth you will experience, any relation to genetics. And is there any way to minimize it.

I have yet to start hrt but I am planning to within the next year when I move out. I am 21 and amab and don't necessarily identify strictly as female. I suppose some form of non binary is the most accurate. My biggest hangup is breasts, on a personal level I wouldn't be opposed to them. However I don't necessarily plan on coming out to family or at work. I work in a very close minded sexist, homophobic, and transphobic field. Is there any way to predict how much breast growth you may experience and is there any way to prevent it if it gets to be too much (I would prefer not to have massive boobs).