Mark, Don't Measure - Holding trim in place and marking it is always more accurate than measuring, often faster and iteliminates mistakes. This is good advice for other types of carpentry work too, like siding, laying shingles and sometimes even framing.
Despite its reputation, installing crown molding doesn’t need to be difficult or time-consuming. The job requires a lot of measuring, cutting and nailing, but if you take precise measurements and follow a few simple guidelines, you can easily add the beauty of crown molding to your favorite room. The key is to plan before you start.