While you can grill a burger or steak without a cookbook, rotisserie grilling is tricky. With everyday grilling, most people cook things with roughly even thickness and they can tell when the meats are done just by looking at them. Try something bigger, like a leg of lamb, a whole turkey, or a full pork shoulder, and they have a problem--most grills will completely char the outside long before the inside is cooked to a safe temperature.