Preheat oven to 400 F. Cut a slit into the center of each chicken breast to make a pocket. Lay breasts between two sheets of plastic wrap & pound flat to about a 1/4-inch thickness. On cut side of breasts, lay sliced Gouda cheese. Divide guacamole between breasts; roll up chicken breasts & wrap each one in two strips of bacon. Make sure bacon ends are all on one side. Use toothpicks to ensure all stays in one piece.