Thanks everyone.
My next hurdle--and suddenly much more immediate and pressing since I expect to be actually starting on T very soon--is coming out at work, and I plan to do it in the next day or two, just deciding now how to best approach it. I have one coworker/friend who knows already, and she is a senior full-time employee (I'm considered part-time temporary, but I've been there for over a year and so I have daily contact and interaction with all the regular staff) so I've asked for her input on how best to approach it.
There are no bathroom issues, since it's a small workplace and the employee bathroom is unisex and single use. My workplace is a small branch of a larger organization (city/county) and I don't really see a need to involve HR at this point, except to possibly get a new id card/photo at some point. Initially, though, I simply need to let all the people I work with know what's happening, so that my RLE will be 100%. Work is the last place left that it isn't already.
