Try & make sure you sit with your knees lower then your hips & don't slouch back on the couch, slouching back encourages posterior babies. Also try & get down on your hands & knees & scrub your skirting boards or something while your down there LOL. Might help bubby get better positioned. Laboring posterior babies suck!

eta - if you don't mind me asking.. Whats your plan c/section for? Will you go in if things ramp up or just go naturally?