One of the problems with this approach is that the longer you wait, the more unlikely a good transition will be possible. You're still maturing in your late teens, and hormone therapy still has a good amount of time to make your body look the way you think it should look. The earlier you start, the better your results.
This might be crossing a line, so I'll apologize right now if this is hurtful (I don't mean it to be an asshole, it's just true), but I assume you've seen hey's pictures in the RL thread. Perfect example of starting transition too late to have much effect. The physically masculine features are essentially set in stone without extensive cosmetic surgery.
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