bashing the life out of a wall is very good therapy.
Plaster is amongst the easiest and most fun things to destroy ( i mean remove) I'm currently removing the plasterboard in my ensiute to replace with a compressed cement sheeting so I can tile to the ceiling.
What i have found is if you score it with a stanley knife where you want it to break evenly and then bash the life out of it with a jimmy bar it comes off quite easily. If you want a cleaner way to do it, score in a checkerboard pattern across the area you want gone and again bash the life out of it with something heavy.
Its probably unconventional but it works.
Good luck!:2tsup: