Man boob to woman boob conversion, among a few other things

Hi! I finally mustered up the the courage to post here for the first time and would like to ask a few questions.

1: The title, how well do "man boobs" or whatever you call them translate to women boob's when you go on hrt?

2: How does hrt affect body hair and facial hair?

3: Is voice training the only way to achieve a fem voice?

4: lastly what are great ways to achieve euphoria?, I have been trying out/ wearing feminine clothing and it feels so strange yet so intoxicatingly good?

That's all my questions for now!