I naturally have/had a passable feminine voice, however my issue was the small bump.
I have come to find out it actually makes it worse speaking from personal experience,
I am currently looking into laser vocal tuning to fix it with Dr. T (voice doctor).
My original surgery was done under general along with 2 other procedures by Dr. Burin @ PAI (July 2009).
My neck is very smooth, the scar is short and hidden under the chin.
My voice gets tired easily and i lose it quick. I believe it was a result of aggressive shaving.
Dr. T evaluated the information i provided him via e-mail and suggested probably the vocal cords became loose and they need to be tightened up for me to get a natural high result.
Not sure if it was worth this surgery since my trachea was very small to begin with.
If i was to go back in time, I would have done it with an Ear-Nose-Throat specialist surgeon who could have been careful with shaving and the vocal cords.
It's not worth the damage to the voice to have a smooth neck; the neck is smooth now but the voice needs fixing as it crackles and goes hoarse.
I can still speak and pass but it has affected the quality of my voice, it is a bit of an effort to keep it that way.
So there was a trade-off. Plastic surgeons really need to step off some areas of medicine/surgery, and leave it to the specialists for that area.
A local ENT could have done just fine, places like Thailand really should be considered for holidays, not surgery.
That is my very own experience and advice.