My mam did this Jamie Oliver recipe a couple of years ago and it was delicious!
https://www.jamieoliver.com/recipes/goose-recipes/day-ahead-stripped-goose/
You cook it the day before and keep the meat in some of the fat to keep it moist for the big day. And the left over fat is for the roast potatoes. Get a deep tray for underneath as we got loads of fat out-way more than we expected.
Also, it has a big chest cavity like a duck does. But obviously much bigger. It was surprising how much larger it looked in our kitchen/oven compared to in the shop!
Whatever you do to it, Enjoy!