I'm in a similar situation. I'm going on 34 years of a happy marriage. Transitioning has been a gradual process that began three years ago. First, I began wearing women's underwear. It was exhilerating. This progressed to wearing angdrogenous women's clothing like shoes, pants, leggings, sports wear, panty hose, jewelry and leggings. Very satisfying. They fit me better than men's clothing, and they're more comfortable. I've started painting by toenails, and most recently had both ears pierced. She accepts me wearing panties, painting my toenails and wearing "men's" earrings, though her initial reponse was not positive. I still keep a pretty low profile at the office, but the earrings stay in.
She asked me if I was "turning gay." Of course, we all know you don't "turn" gay. We're born this way. I replied that I'm attracted to women, which is true, although it's more envy than sexual attraction. I'm asexual, which works because her libido has been non-existent for more than 10 years due to a health condition. I admitted to her that I've always been a "girl" at heart. She's fine with that. I'm comfortable with where I am, and I don't know if I'll ever fully "come out."
I have what I call "girl's morning out" where I put on makeup and more feminine clothing and jewelry to go to the grocery store or shopping on weekends before she gets up - she's a late sleeper. One more reason to look forward to the weekend. It's satisfying when I'm referred to as "her" or "ma'am." I have feminine features, and it's easy for me to remove body hair because mine is more like a female, sparce and fine. I'm a runner and have great legs, so I'm told by other women who've expressed their envy.

I looked like a girl growing up and was kidded about it by everybody, even family. My highschool baseball teammates affectionately gave me the nickname "Tammie", which I didn't mind.
I've always been feminine from an emotional standpoint. Right now I'm having a lot of fun and feel much better admitting to myself that this is who I am and who I have always been. I guess we all have our comfort zone. It's been very liberating. I know this is more than you asked for, and I apologize to everyone for this long response, but this is an important topic near to my heart and needs to be shared among us. I have a happy marriage, and I wish you the best in your marriage.