Well, I have never cooked one but I found this:
SWAN. Pluck like a chicken or goose, scald, or boil; spit, skewer in four places, and roast with all its feet and beak, and leave the head unplucked; and eat with yellow pepper.
Item, if you wish, it may be gilded.
Item, when you kill it, you should split its head down to the shoulders.
Item, sometimes they are skinned and reclothed.
RECLOTHED SWAN in its skin with all the feathers. Take it and split it between the shoulders, and cut it along the stomach: then take off the skin from the neck cut at the shoulders, holding the body by the feet; then put it on the spit, and skewer it and gild it. And when it is cooked, it must be reclothed in its skin, and let the neck be nice and straight or flat; and let it be eaten with yellow pepper.
Think I'll stick to chicken
Jenks.