I just discussed the OP with my wife. She isn't so much supportive as very accepting. On the support side, if I was having huge issues moving forward, she would help but doesn't seem to see any need. That said, I beat myself up and stress over things but once I get to the decision stage, she usually just says "get going then". She has only told one workmate whose response was "and you are still together?" While surprised, I just let it go. I have decided I am not trying to stop my family talking about it. If they need to, they should. I have only asked that they use some level of judgement - preferably a high level!
Apart from the trans/health support industry (psych people, hair removal, physio, GP etc) the biggest challenge I have faced is an initial group voice session at a university last week. The challenge for me (I do not present as female much and had rushed from work to get there) was to be identified as trans to the whole 4th-year class. These are the people who will be conducting the therapy sessions in a supervised environment. Wasn't expecting to have to walk into a room with all the students sitting there. Oh well, another 20-odd people in the know!
My point is that lotsa people will know sooner or later, it will just spread or it won't. I refuse to stress over who does or doesn't know. I don't imagine it will be a surprise to some when it happens if the "girls" carry on. Work disclosure will be interesting and I may have to tell my manager as soon as tomorrow since I want leave to attend voice therapy over the next few weeks and perhaps a nose fix later in the year.
The risk of taking a hit to my income is not as obvious for me (I am a specialist and there is no career path at my current employer and don't desire any change but the insidious slow marginalisation may happen), and I sympathise with Julie. A bit of a dice-roll that one and not something you can plan for except to be as good as you can be at servicing customers so that there is no good reason for them to leave you post-transition.