Transgender issues have been in the spotlight this year, mainly thanks to Caitlyn Jenner's very public transformation.
But imagine what it was like to go through that process 45 years ago.
Liz Roberts was the first New Zealander to undergo full sex change surgery - her first operation taking place on the same day as the moon landing.
Her biography, co-written by Ali Mau, is out today.
She started writing her story a few years ago, but says when she sent the book away to be checked, it came back so sanitised that she dropped it in the bin because she didn't feel like it was her story anymore.
She spoke to Paul Henry this morning about her experience.
Watch the video for the full interview.