Izzy said exactly what I was going to!
Actually I had originally planned to transition in early June last year, but in the end that was too far away and I jumped two months earlier! Although I was eager to get started it didn't mean I wasn't petrified as the big day eventuates!
I'll be honest with you, going full time at work is a huge step. Enormous! If your work place and colleagues are the kind of people who will be accepting and supportive, then that makes it a lot easier. If people respect you, and you seem like such a pleasant lovely person I can't imagine that they don't, then you won't lose that respect.
As I neared my transition I wondered if I'd be able to do it every single day, up until then I had only been in girl mode when it suited me. Turned out, doing it every day was relatively simple and became more straightforward every day.