Well this is rather interesting as I am dealing with this very topic right now.
I have absolutely no idea if I will pass or not, and I am not just saying that either, its not a me me me thing by any means.
I drove myself to the point of madness, trying to give myself some sort of reassurance that its gonna be ok and I will pass one day, but truthfully I dunno, it really could go either way. I am still on HRT, I did decide to go ahead with everything anyway despite not knowing the outcome.
I don't really know how anyone knows if they are gonna pass or not before they start, unless they are already extremely androgenous or fem looking or very young for that matter. I passed the young part as I am starting at age 33, and so far as facially I have some traits that could fall on either side, hence my unknowing. One thing is for sure, I do not pass right now, and I do not even try because there is no point, its only been a few weeks on hrt, for now I am ok just dressing in a way that I feel comfortable.
Also to Fiona, its not a choice, well at least for me it wasn't because if I didn't do this I wouldn't be here now. People have done without for thousands of years?? um, I think not, history tells us a very different story and across many many cultures. Maybe your post was in jest though and I read it wrong.
Miya