For me, my nebulous goal was to be a complete woman, inside and out. All those are milestones, yes. But they are just prerequisites, steps on the way to complete womanhood. You might think you are a woman at any point in the process. You might know that you were a woman inside from before your birth.
Some poor folk can get it all but the passing.
They have the hormones, the surgery and the belief, but their voice and architecture give the away every time. As a man. I have been fortunate enough to have the choice, but having made it must stop rethinking it. It is not unlike a marriage vow or a moral code that one imposes upon oneself. Sure, we all can change.