I doubt OP will answer as they seem to be replying only to posts that give them the opportunity to express some shared expereince of "womanhood", but still...
Forgive the obvious question, but if you don't know what it means and you don't know how to do it, why did you swear you would do it? What did you think it meant when you were swearing?
If your question is disingenous and intended to show that a legal challenge is unworkable, I agree.
What you are highlighting is the unworkableness of trying to use a legal fiction to fit "gender", whatever it is, into pre-existing laws and conventions which were logically and meaningfully based on sex instead of building new laws and conventions from the ground up based on gender.
Keep them based on sex and the logic is very simple - just go back to the first principles. Sex based laws and structures exist to mitigate a sex-based need, risk or inequality. It is easy to justify them where they are still needed, and to drop them when they are not.
Try to keep the same outcomes but base them on gender and the whole thing falls apart. There's no longer a way to think logically about what a law means because there is no route back to first principles, needs, risks and inequalities. The people demanding the rights and accesses of sex based on gender are not the same people that had those needs, risks and inequalities and so their claims make no sense.
So I hope that first legal challenge does happen because it will be a clear demonstration that the entire concept of a GRC is flawed. A legal assertion can override laws but it can't override reality.
OP, I'm glad your extreme cosmetic surgery has made you feel better about yourself, but all you have done is enacted a physical representation of your own ideas about your and the opposite sex.
The changes you made to your body or the reasons you made them, while undoubtably extreme and demonstrating a committed belief on your part, ultimately have nothing to do with actually being a women or being female. It's something that makes sense to you because of how you think about men and women, but the "woman" you have fashioned is no more representative of or connected to the reality of being female than the stereotypical little green man is representative of or connected to actual life on other planets.
That is not to say she isn't real or meaningful to you, or that she doesn't bring you genuine ease and happiness. It's just to say this is a you thing only. It is very meaningful and important for the person inside your head but it doesn’t create a new reality for the rest of the world.