For a lot of people that means they dress and act in the gender that makes them feel more comfortable and more like themselves
How does one act and dress female?
Some people take hormones to help their bodies reflect the gender they feel, others don't
How does one 'feel' a gender?
Some people go further and have surgery to better reflect their chosen gender
If gender is about clothes and his you act, why is surgery relevant?
and have official documents to reflect those changes eg, gender recognition certificates, passports, medical records, driving licence etc
So falsifying legal documents then? Why on earth should that be allowed?