One thing I have learned over all these years is that people who appear to be different from us are more like us than we realize, and that people who appear to be like us are different in ways we didn't expect.
The only thing "normal" about us is that we are all unique.
While some people are so afraid of differences that they will refuse to accept them, most people are too busy and involved in their own lives to care very much whether you feel like a boy or a girl.
Nuclear plant outages bring a lot of people together in a tight place for a lot of hours. Learn to laugh at the stupid jokes - especially if they are at your expense. There is a LOT of drama in situations like an outage; who is sleeping with whom? who has a gambling problem? who sucks up to the boss? who is too overweight to fit into the coveralls? who this? who that? Gossip runs amok. There may be snickering, whispering, and joking in the break room. Don't let it get to you.
Femininity even among women is suppressed by the hardhats, work boots, safety glasses, and scrubs anyway. If the women there don't look very girly, then there is no reason for you to outdo them. I guess my point is that if you identify as a woman, remember that women in this situation dress a lot like men in the first place. If they aren't wearing eye shadow, skinny jeans, and lots of jewelry to work, follow their example. (There will always be one or two women at work who just don't get this. You can't help that. Showing up for work too dolled-up is a bad idea for any woman, including you.)
The determining factor will be your attitude. Your identity and self-image are your business. Keep it that way. You will encounter much more resistance if you display the attitude, "you HAVE TO accept me" than you will with "you have no reason to reject me". Do the work. Keep the drama to a minimum. Being the newbie means that you should be listening more than talking anyway. Most people, regardless of their opinion of your gender identity, just want to work with other people who carry their share of the load. If you are going to work to do the work, rather than to prove a point, you are going to have fewer problems.