Some companies, while predominantly male in their Engineering or Software departments, are also very supportive and great places to work while in transition.
At my last employer (Apple), I had two co-workers transition on the job. In both cases, the HR depearment reached out in advance to make sure all co-workers and people on other teams would know about the transition, know to contact HR with questions rather than the employee, and understand how to interact respectfully and politely. The company medical insurance plans covered all transition-related medical care, and leaves of absence could be arranged for major medical procedures.
I was rather jealous of them! Ah, well. Better late than dead, I suppose.