Gender reassignment is a process where a person decides to change the gender that they assigned at birth. In other words, female characteristics are substituted for males and vice versa.
Yes, I have watched a few shows about gender reassignment. Seems to be a very difficult surgery.
I would think the surgery would be very difficult where body parts are reconstructed and a trans gendered person's physical appearance and function are altered to socially align with the identity they choose.
Yes, I know they have to take quite a bit of medication to alter their hormones as well. Where women mimic male hormones and vice versa. 
It is a treatment for transgendered people for gender dysphoria in order to help them align with their gender identity.
I can't imagine my own self doing that. No doubt it is very emotionally hard too.
I'm sure it is very emotional as gender dysphoria is something an individual goes through as a result of the gender they are assigned at birth but one they do not relate to.
Yes, so they probably never actually feel like their gender their entire life. Well, I know that nobody could imagine being able to change genders years ago! Science and medicine has really advanced through the years!
Sex reassignment therapy
Sex reassignment therapy is the medical aspect of gender transitioning, that is, modifying one's characteristics to better suit one's gender identity. It can consist of hormone therapy to modify secondary sex characteristics, sex reassignment surgery to alter primary sex characteristics, and other procedures altering appearance, including permanent hair removal for trans women.
In appropriately evaluated cases of severe gender dysphoria, sex reassignment therapy is often the best when standards of care are followed. There is academic concern over the low quality of the evidence
are male to female cross dressers and vice versa for characters, especially with certain time periods.
History of transgender people in China Early sexual reassignment surgery.
Sex and gender were arguably fluid within the late Ming and early Qing dynasties as many female infants were forced into sex changes to be males. This, in turn, affected those children into living transgender lives, whether through physical transformation or—if there were not a sex change—continuous cross-dressing.
History of transgender people in China Laws regarding gender reassignment.