I would announce my transition online and isolate myself for 6 months with no pictures so I can try to keep being identified by society as the same person and not become undocumented and lose everything I own etc. Nobody's going to believe a story about magic bullshit, they would just assume you're a different person.

I would become a lesbian. No way I want cock im me.

The same thing I would have done the moment I woke up anyway, but with a vagina. Masturbate.

Depends if other people could tell, or if it was just my genitals that changed.

Have sex as often at possible. Which probably is very often.

I’d fart so I could feel it bubbling up through my vag.

Take a hot shower and avoid cold water I figure.

Is it just one day, or ongoing? Either way I'm probably going to take the day, call out from work, tell my family I'm not feeling well, and furiously google my symptoms.

I'd tell her that she overslept, which is why I woke her up.

as a trans guy this question is very silly to me

Celebrate

Not really a man (Agender and Intersex) but I am Male so I feel like I can answer this one.

I have a developmental condition which affects my body's ability to produce androgens so for me I wouldn't be much different aside from genitals since I never finished puberty and likely wouldn't have then either.

Not as big of a setback or difference than it would be for someone else but not being able to pee while standing would be a very big negative for me and I'm not really sure what I would do about that (probably get a Phalloplasty so I can pee properly again).