I made christmas goose one year. I wanted to roast two birds, but only had one roasting pan so I picked up a disposable pan when I got the birds. Huge mistake. Foil pan sprang a leak and a litre of goose fat flooded the bottom of the oven. You have no idea how much fat comes off these scrawny birds. Be prepared for that.
There is also very little meat on the bird compared to a turkey, so add 50% to your estimation of what you'll need. They also are a bitch to carve as you're tearing it apart looking for the meat.
Since that day, all geese are safe from me.
lefty