When we stayed in KDH we ordered a pot from Mulligans. Up north in Duck we've done Dockside n Duck.
You can pick it up earlier in the day and then you cook when you're ready to eat. As for directions, you just put liquid of choice (we use beer) in the pot they provide with seasonings they provide. Any quick cooking seafood, like shrimp or scallops, are added last 5 mins or so. They come with directions but I think it normally takes about 30 mins or so after it comes to a boil.