I wish you all the best for telling your wife, I was so nervous telling my ex girlfriend that I was shaking like a leaf, I was very fortunate that she didn't take it too badly at first but she's convinced that the 8yrs together was all a lie even though I did truly love her, it was my body that I didn't love.
We chatted for hours & it was very surreal some of the topics that came up, we discussed makeup, shaving legs, men we are attracted to & my previous experience with men when I was a teenager (before I started really suppressing my feelings).
Once it sunk in over the next week she started taking it a bit worse but she still wants to be in my life so i'm fortunate that she is such an amazing woman.
please feel free to send me a message if you want my limited advice, all I would say on such a public space is try to be honest but not too honest (if that makes sense)
Best wishes & good luck