I recently took down a drop ceiling and hung new drywall. The beams in my house were unlevel which caused my drywall to be unlevel. I'm want to hang up crown molding but I dont know how to get it level. The gap between the ceiling and the walls ranges from 2" to 4 12" depending on where I measure. I've also noticed that the drywall corners that border the room are slightly raised and unleveled. Does anyone have any suggestions on how to fix this problem? Please help!