I'm only about half a year in, so take it for what it is. I'm 26 now and started when I was 25, so that's helped quite a bit.
Emotionally, I really don't think I'm that much different. It's not to say that there isn't some effect there, but I've always been very sensitive to others, and even more so, I've always been pretty good at keeping my emotions in check without repressing them unhealthily. A time and a place for everything, as they say.
I don't know when I first noticed it - maybe a month or two ago - but I actually had to blink and do a legitimate double-take when I looked at my chest in the mirror and saw it was sticking out a ways. I still don't have full-scale breasts by any means, but they're definitely and visibly beginning to come along.
My shoe size has already gone down a ways. I can wear a size 10 (women's) shoe now, which gives me a lot more options at the store, hehe. My skin is softer, and although my weight as stayed about the same, my belly has become softer as well.
In addition, my body hair growth has thankfully diminished quite a bit. I used to have to shave my arms and legs every other day. Now I can get by for a week or so without absolutely needing to.
Finally, I've been told a couple of times that my face is beginning to look a little different. While I hope this is absolutely true, and I've wondered if I'm seeing it myself, I still don't think I've changed my appearance significantly. Here's hoping, though!