Okay, I have a cat, and my boyfriend has one. In the future we plan on moving into an apartment together, instead of me moving into his house or him moving into mine. So we have a unique cat situation. We won’t be introducing cats to a house that already has cats. So not only will we have the trauma of a new house, but throw in a new cat as well. Neither of them will have the “home field” advantage. How difficult will this be?