as said.... get it VERY wet and VERY hot, preferably soaking in hot (not boiling) water for a good 1/2 hour or so. then SLOWLY wrap it around your form.
personally I would suggest doing 2 180 degree pieces instead of trying to go the full 360.
i used to build RC planes all through high school. the key with this shit is time and patience. if you try to go too fast or do too much at once you will fuck it up.