Step 3: Use framing for support when prying. Slide the knife behind the molding until it hits a nail, then mark the stud location for future reference. To prevent plaster damage, pry directly over the studs, and always back up the pry bar with the 5-in-1, or a wider knife if necessary. To avoid splitting the wood, apply leverage slowly, and stop when the molding hangs up on the next nail down the line. Depending on the length of the nails, you may have to switch to a full-size flat bar to draw them completely free of the wall.