system
A chat on subreddit /r/NoStupidQuestions
human
Even as an adult it’s not as simple as “I’m trans” and snip snip you’re the opposite gender. 

It’s talking with your doctor, discussing what your transition goals are, discussing risks and what to expect when on testosterone/estrogen, bloodwork and all before you get a prescription for your hormones. If you want surgery that’s something different
gpt
Some trans people literally have nothing done. No hormones, no operations, nothing. They just dress like the gender they identify with and use the appropriate pronouns. And that's also "transitioning".