In a large bowl, with an electric mixer, beat cream cheese with cheddar, mustard, Worcestershire sauce, and a generous pinch of pepper until well combined. Mix in 1/4 cup pecans. Cover cheese mixture with plastic wrap, and chill at least 2 1/2 hours or up to overnight.
Divide the cheese mixture in half, and shape each half into a ball. Spread remaining 3/4 cup pecans on a plate, and roll balls in pecans to coat completely, pressing nuts to adhere. Serve chilled.