My mom didn't want me to medically transition until after I had school finished and a career going. I knew I couldn't put myself through that, so I left home and got my first shot of testosterone the day I moved out. As the months went on and the changes started becoming harder to ignore, she slowly came around.
It was awkward and uncomfortable for a year until I told her I was having top surgery. She jumped on board and took out the surgical drains. She still struggles with female pronouns, but I know she's behind me one hundred percent.