Trussing is not necessary for a good roast chicken. In some cases, trussing can help the bird cook more evenly, but if you watch the time and the temperature, the breasts shouldn't dry out. If you like the look of it better, you can simply tie the legs together as I did in the photos above. But I did this purely for pretty photos. Normally I just put it in the oven with no tying or trussing and it tastes great!