I first did research. Researching about non-binary genders, about myself, about (partly) transitioning, about transgenders...
Because I strongly want to have my breasts and uterus removed and have a lower voice and male fat distribution, I also spend some time figuring out if I am androgyn or if I am more like a feminine transguy.
I tried to find stories from other people about their non-binary trans* experience, watched some youtube channels, signed up at some forums.
Before I faced the fact that I am androgyn, I was already seeing a therapist for my depressions and Asperger's, so I talked about the gender thing with her too.
Came out to friends and parents
Asked friends and therapist to call me by a different name (legally I can't change it yet untill I have my uterus removed in this country), still have to inform my parents about it (but they aren't really supportive, so I am still hesitant to tell them).
Signed myself up at the gender clinic so that I can transition into a body that feels come comfortable/better to me.
Started to get some guy's clothes into my wardrobe
Thinking about how androgynous I want my appearance to be
Started feeling more comfortable in my skin after coming out, feeling much better, much more relaxed, much more myself.
And generally, a lot of thinking.