I took out a fireplace and have rebuilt the wall, now its time for drywall. the wall is 14ft wide by 8ft high, it has a window on one end and a door on the other end. When I removed the existing drywall I stopped at a stud 6 inches inside the window on one end and middle of the door on the other end. I plan on using 12ft sheets applied horizonally. My question is would it be easier to just remove all the drywall corner to corner? I worry about matching the seem from the old to the new sheets.