Did I hear my name dropped?

Actually, from about the age of 13 until 24, I DID lead a very active double life. Youth, hormones, and a fair complexion made it possible for me to live virtually undetected in two vastly different identities.
I don't think a "perfect" double life is possible though because there are some things that can not be changed back and forth in a short period of time and things that will "carry over" - like you HAVE to shape your eyebrows to look nice as a woman but, when playing the male role, shaped eyebrows are definately suspicious! One would need good Hollywood makeup to carry it off.
For me, I chose to emphasize the feminine role, which left my male presentation looking rather effeminate. Because there was overlap with some people and places (where I appeared in BOTH roles at different times), I chose to make my male and female presentations as different as possible, things like short blonde hair as a male and long dark hair as a female, very sloppy and unkempt as a male, neat clean and well-dressed as a female, reserved and gruff as a male, outgoing and bubbly as a female.
A few years ago I was going through some old photographs and came across a young woman I didn't recognize. I was puzzling over the picture of this vivacious girl with the long dark hair, slinky leather jumper, go-go boots (remember them?) and with the ear to ear smile and wondering who she was and why I had her picture. Then I recognized the background as my parents living room and rememberd the boots - that was ME! I would have passed me on the street and not even twigged!
A "perfect" double life? Not without your own Hollywood crew and a "neutral place" to make the switch! (A telephone booth only works for Superman!)
At the very best, there will always be part of one life seep through into the other and "tell-tale" things that sharp people will pick up on, something as small as a tiny bit of nail polish under a cuticle or the way move when you think no one is watching.
I think you could have one side "perfect" but not both.
JMHO YMMV