Dunno. My lips are more visible now I think, but that might just be due to my general change in complexion and not the lips changing at all, I have no idea. I do not think your chin will change much but don't worry about it! It is fine. Really.
And yea, I am hesitant on getting an awesome haircut too. Pretty much for the same reasons, I know I will some time though. Just gotta go to the haidresser a few more times and get to know her more then get her to gimme opinions on a good style.
Also, just to get this straight, you are not on HRT?
PS 6ft is model height like me, congrats