I have a job, my gender marker shows the dreadful "M" - but my name is legally Samantha. Either I pass very well or the people I dealt with were very very nice, because even though I showed them my ID and put down male on all of the forms, they still left my gender is blank, I change in the female locker room, and I wear girl's costumes.
My only apprehension was the name, not so much the gender marker. I'll definitely get it taken care of soon though.