... and his initial reaction was brilliant!
He was very supportive and he asked some good questions but wasn't intrusive or disrespectful in any way.
I've been working for the same company for more than five years now, and whilst they're by no means perfect (what company is?), they have been very accommodating and tolerant of people's differences. He assured me that I'll have the support of the entire company (or he'll want to know about it!) and that he'll do whatever he needs to do to make my transition as smooth as possible within the business.
He even said - get this! - that it would be good for the business if I were to transition, because he'll wind up with a happier, more settled person in my role. What a guy!
I'm feeling rather fortunate and grateful. If only it were so easy with my family!