I get Maam-ed in blue jeans and sir-ed in a dress, so I usually go with my Utilikilt and let them guess. I despise the social construct that puts me in this position, and I will fight it until I win or I cannot take the derision. I could fill multiple volumes with more detail if you want them, but unless you ask I won't just vaunt them.
An excerpt from my brief autobiography that I penned to go with the anonymous trans survey, as usual, I didn't even realize I was rhyming until I proof read it.