The first day felt absolutely divine and I do not want to stop
You've almost answered your own question. I cannot speak for all trans folk, so I'll just speak for myself.
I'm not strong. I get exhausted. Sometimes I feel like giving up or hiding. It's a lot of work even if there weren't people trying to erase us.
But when I give up; when I stop making progress, the dysphoria comes back, and it only gets stronger the longer I ignore it. It's the reason my egg cracked in the first place. Once I experienced life as myself, I can't go back.
No matter how hard it is to push forward, going back hurts even more.