For Becoming more Masculine- just a few tips:
1)
Sitting. Unlike women, guys rarely cross their legs. You'll be better off sitting with your feet firmly on the floor and legs slightly spread.
2)
Walking. Women tend to walk like they are on an invisible line maybe 1/2 a foot (or less) across. Men tend to walk on either side of this line. Men tend to swing their arms less and are tighter in the wrists. Try to lead more with squared hips, aka don't swing them.
3)
Standing. This one is pretty simple: beware of putting your weight on one hip. This is an overtly feminine stance.
4)
Conversation etc. Be confident. Make eye contact (don't be creepy though) and just say what you are thinking. Talk more directly, try not to pause as much. Men are much more direct in conversation.
This being said, not all trans masc peeps need to pass or even want to. Act more masculine as you see fit