I can tell you from personal experience that it is wonderful but frustratingly slow.
Having said that I definitely recommend talking to a doctor specialising in gender dysphoria as it isn’t just a case of taking hormones and waiting. From what I learned at a new patient talk at the gender clinic in London (England) if you don’t do it right then you end up with small, hard, conical boobs that will never get any bigger no matter what you do. If it is done right then you can end up with boobs one size smaller than your mother, hers grew one size when she was pregnant.
So if you are going to do it, do it right, but go for it girl. After two years I am an A, and still growing 😀
I'm a dominant sub, but definitely sub to a dominant.
☺-Proud to wear Mistress Joanna Swift's collar-☺