Not to discourage you, but cutting and installing crown molding is much more difficult than chair rail. You will be dealing with compound mitres, that is, cutting TWO angles AT THE SAME TIME on every piece. If you buy a compound miter saw, this makes it easier, but they are more expensive than regular power miter saws. Also, you'll be nailing from a ladder, which is more awkward and more likely to ding the expensive molding. My suggestion is to hire a pro, if you really want nice looking results. Otherwise, go to a rental center and RENT a miter saw AND an air-powered finish nailer. Even Norm Abrams doesn't nail by hand any longer !!