I took another step the other day...
For about a year now I've been growing my hair out...then got earrings, and after the healing time I started wearing "girlie" earrings...then I did laser, and shaved arms (and everything else)...started wearing lady's sandals in the summer...allowed myself more ladylike mannerisms (tilting my head when listening/talking, smiling, etc)...at each step, my kids were like, "Why's Dad doing that?" Their mom always sent them to me, and also told me what they'd asked/said (because they don't always come back to me).
A few months ago I started with the nail polish; purples and metallic reds are my favorites currently.
I'd told them a few months ago that I was in therapy for CSA and other issues, and that all these things were to help me reduce anxiety etc. I'm still Dad, I'm still there for them, no worries there.
So about a week ago I told them (individually, as they seem to listen better when I'm one-on-one with them) that my Dr. and I had discovered that I don't tolerate testosterone well...Explained T is a hormone that can increase depression if it's too low. It is normally a "male" hormone, but for some reason my body/mind doesn't like it anymore. A person needs hormones to function, and if T doesn't work for me, then Estrogen should be tried.
What this means is, among other things, that my taste in clothing etc *may* change, so don't be surprised or shocked. I'm not planning on wearing skirts and dresses, but maybe a woman's blouse etc. (They already knew about my pink socks and women's undies...they were cool with that). (The side effect of having breasts can wait, since it takes a few months for them to really show--I can hide them until then if needed).
They know that this is all "my" thing, that I'm still Dad, that they are good boys, doing great in school, friends, etc and they should keep on doing what they're doing. I'm proud of them, and hope they understand what I'm going through...
And they do.

One step at a time, let them assimilate the new stuff, maybe let them grow some more, then inch another step. This process I've described has been about a year's worth...HRT is just around the corner, fortunately its effects are relatively slow.