as far as i know it is no possible to control any weight you put where on you body it just goes on. it is said though loose all the weight in male form first then hrt will help put it back on a female form, dont expect you existing weight to suddenly want to go to all the places you want it to.
and meh... weight is the bane of my existence, im sitting here now feeling verry guilys i ate 2 veggie hot dogs form yesterday