Are cowboy boot sizes bigger than your regular shoe size?

"When ordering your first pair of western boots, you should start with a ½ a size down from your normal shoe size. If possible, you should stop by one of our stores (Cavender's) and try on several pairs of boots to see how each brand fits. We suggest you try on boots in the afternoon when your feet are the largest, and wear socks you would normally wear with boots, lightweight - midweight socks."