Congrats Maegan! That is great that you took such a good step and you have so much support.
I started changing little things about 7 months before going full time. I changed my hair, my clothing style, and even my voice. By the time I came out at work, the only thing I had to change to go full time was to put on makeup, and quite binding my chest, well, that and they learned my new name. I think that made it a lot easier on my coworkers.