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Step 1
Decide which piece molding will butt into the corner of the wall. Perhaps the one with the longest run would be best.
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Step 2
Cut the end so that it fits nicely against the wall. You can make this cut with a chop saw. Use finish nails to tack the molding in place.
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Step 3
Set your miter box at a 45-degree angle, and place a second piece of molding in the box. Saw it with a miter saw. The end will have an inside miter. The cut will slope from the finished front of the molding to the unfinished back.
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Step 4
Use a coping saw to cut the mitered end of the molding. You will cut from the mitered end straight down with the coping saw, or slightly back at an angle toward the back of the molding. The coping saw is the tool that will make the cut necessary to give the appearance of the trim being mitered on both ends because it preserves the curves of the trim. A miter saw alone makes the cut too blunt.
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Step 5
Put the cut molding up against the end of the piece of molding already tacked to the wall. Thanks to the coping saw, it will appear as though you mitered both pieces of molding.
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Step 6
Practice cutting other styles of molding with a coping saw. With some molding you will have to leave the top edge of the molding and cope saw away the rest. You can always cut little bits away of the molding until you achieve the perfect fit.
