Interior design is, of course, a matter of taste. That means not everyone will agree on it. But if you poll most interior designers and interior decorators, you’ll come up with a pretty good idea of what’s sure to land you in hot water design-wise. As you’re contemplating your next project, make sure you avoid these seven deadly sins of interior decorating: Picking the Paint First All too often, paint is the first thing homeowners think about. But paint comes in such a wide variety of shades that it’s actually smarter to pick out other elements of the room first.…