However, how can we be sure that a person can actually change even some parts of ones identity?
It seems to me that most people assume that our brains can be molded at will, simply by repeating some intended behavior. I'm not saying that this is impossible, but I highly doubt the extents to which this works.
There are so many variables at play, that it is unlikely for any mechanism to simply pick up the "good parts". At most, I would assume that we can learn things cognitively, and some muscular patterns.
Being able to change wants and desires at will however seems almost unattainable.
Doesn't keep me from experimenting with it, though :) And I'd love to hear others opinions on this!