It's really not bad, and as long as you watch out and don't puncture the intestines or gallbladder, you really can't screw it up too bad. There are plenty of YouTube videos. If keeping a bird dressed whole as a roaster, always bring the guts and internal organs out and away from the bird before cutting the liver away from the gall bladder. My 12 year old son is learning how to do it. I let him get the organs out and harvest what he wants for fishing. He helps his dad hold the birds down while my husband bleeds them out, that is their preferred method even though we have a killing cone. I will eventually let him do one start to finish soon.
A Benchmade Meatcrafter is the knife I prefer to use. We do the same method as if you were to field dress a Wild Turkey. Lift up the skin over the breast and slice into it and pull the skin apart, exposing the breast meat fully. You then fillet the breasts off each side of the keel. Cut each shank off. Then you press the legs backwards toward the table until the hips dislocate and pull the skin off the thighs and over the drumsticks. Then cut off the leg quarters off at the hips. Once you have all your edible meat off the bird, you can harvest the organs if you want them or just dispose of them with the carcas. We cut the keel bones off with a hack saw for the dogs, so there isn't much of a bird that goes to waste.
Occasionally we will scald, pluck, and dress a whole turkey or Broiler but only when we need a whole bird for roasting like Thanksgiving or Christmas. Otherwise the field dressing method is easier and quicker. A vacuum sealer is also a great investment.