Cut the Corners of the Molding
The hardest part of installing crown molding is cutting the corners. You can’t do it like any other trim pieces because the molding sits at an angle between the wall and the ceiling (Image 1). Using a coping saw (Image 2) is the easiest way to cut the corners because a coped joint is tighter than a mitered joint. A coping saw is also good for a beginner. Any gap in a coped cut can be easily concealed with a little bit of caulk.
Another tool that will make the job easier is a power miter saw (Image 3). It’s accurate and makes a cleaner cut than a plastic miter box.