LOL! 300 posts? Yikes. Maybe I need to dial it back some...

I know I'm trans. Pretty sure my wife has a hint too. The changes she's seeing lately are scaring her though, and this was my reason to reach out for help. Scaring her I feel because we have young kids and they need both of us and she's afraid that too much change would jeopardize that. My son is showing some signs too such as secretly dressing in his sisters' boots and asking explicitly to go to the girls' bathroom but it's waaaayyyy too early to tell. But my wife freaks out when he does that and I kind of do too. Yeah, so as they say in the FB relationship status, "it's complicated."
The therapist is more about practical issues and sorting myself out, and most importantly, WTF exactly I want and need to do. I could have done informed consent much cheaper and easier and save time too but I feel that I need to see a therapist because I need not only to sort out my self, but also practical advice. More importantly I am not a psychological/medical professional. I studied a bit of it in college (and was good at it, like all my subjects actually) but I'm by no means an expert.
I don't really want to throw down an ultimatum but either way, do I really have a choice? Do I ask her permission and she says no, I just don't do anything, accept my fate and slowly kill myself inside? Or even worse, just decide one day to end it? Or even worse, procrastinate and have to go through this later on? Or secretly self medicate because I can't live with myself? Or do I come prepared and say something like, "this is what we're dealing with, how should we proceed? I want you on board."
I might have it easier since we really aren't at all intimate anymore, hell we don't even kiss properly, just a quick smack on the lips now. So the stuff that goes on (or rather, doesn't) in the bedroom isn't really going to change. But again, WHO KNOWS.
PS apologies to the OP for this thread jack... I might just start a new one.