I'm not exactly supportive of people getting major surgical alterations because I have the biased idea that people should learn to accept the bodies they were born with. In my mind sex is determined simply by what organs are present, I think 'gender identity' is largely an artificial construct, as for most people I think it is superseded by individual personality.
For instance I don't see myself as 'a male' I see myself as me who has a biologically male body. There is just too much variation in body types and personalities for me to see any specific combination as 'correct', but if someone simply cannot live with the body they were given then I guess I don't mind surgery, just advise against it.