ok,when you go into the room,the door directly in front of you(the southern door)should be closed.when you hit the switch,go through that door,then go to where you need to be.if the south door is already open,then its that much easier.dont spend time thinking about this,becuse its not a puzzle,your just going the wrong way.from the switch room head south,then east,and make your way from there.

its much easier if you pretend that all other paths arent there lol