The first thing? Honestly, find a way to turn back. This is not because I have any particular objection to being of the opposite sex, since if I was born female, all things being equal, I would be attempting the exact same thing. This is perhaps most importantly because everyone I know and care about knows me to be male, and thus simply waking up one morning with the opposite sex would making navigating that exceptionally difficult. Now, if say I woke up under an entirely new set of circumstances, say experiencing an "alternate universe" type scenario, that would be a slightly different story. Chances are I would still attempt to find a way back to my original body, if only because I find I would probably enjoy being male more than female , (just as much as anyone might enjoy being them self, rather than someone else) since the fact that one is male or female is, like it or not, and integral part of an integral part of who one is. But there would be a clear lack of necessity in this later situation which allows less hasty, and thus more precise action to take place.