My take on this, from studying this specific issue before.
First, there are two aspects of masculinity or femininity. One aspect is purely cultural and is what many trans exclusionary feminists focus on because they want the differences to be purely cultural. Yet modern research, especially into trans people, reveals that there are fundamental brain differences between males and females, and that trans people very often have brain structures that look like the sex with which they identify versus the sex with which they are assigned at birth.
This makes things very complicated. How do we tell what is cultural and what is not?
Second, we live in a very patriarchal society that further emphasizes male/female differences and then tries to capitalize on those differences to make females subordinate to males. At one point, females were considered property for males in our society.
So, in my opinion, you can't separate the two cleanly. We're goldfish and we live inside the goldfish bowl. For us to speculate what life must be like outside the goldfish bowl is something we're not well equipped to do.
In my own case, I've not adopted excessively feminine gestures and such but after I came out, many female friends said they realized that how I acted was more feminine than masculine anyway. I socialize, love to talk and listen, and always enjoyed topics that none of the "other guys" enjoyed though I also enjoy topics that men may discuss too, such as politics or sports, because women can like those things too.
Most of my "adopting femininity" has been getting my voice to a decent place (still not happy there but it works), continuing to get facial hair removed, learning to walk as women do (and it's not what you think!!), and learning to not try to dominate interpersonal relationships, something I did before as self-protection.
P.S. If you want to learn a lot about how women walk, and no it's not all in the hips, then experiment with this walking simulator from a bio motion lab.
http://www.biomotionlab.ca/Demos/BMLwalker.html