Yeah, I'm trying this. I started T when I gave 90 days notice at my current job; I'm planning to start next job as male. I haven't been subtle in my transition. The change in my presentation was noticable even before hormones, and my voice dropped within a week of starting T. My skin, hair, and face already look different.
I know people have noticed, and I've gotten a few oblique inquiries. People asking "so how's it going?" more often, and with more genuine interest, than would be usual. A few folks have commented that I've lost weight-- I haven't, but I'm holding even, there's a bit more muscle, and my face has thinned out. But folks at my office don't tend to be nosy, so nobody's really called me out on it.
I'm not sure how this is going to work. My professional community is small enough that my current coworkers will know about my transition eventually. There's no way for me to go stealth and vanish my old identity. So, I'm really just trying to manage the timing so things don't get to awkward. If I end up having to come out before I leave my current job, I'll deal with it. But I'd really, really (really) prefer to avoid it.