The Cat Switch Project?

Harlee and Zara don't get along; Zara is aggressive and territorial. So I keep Zara in my bedroom, and she's not happy right now. She's been bouncing off of the walls and rattling the gate. Harlee is currently in the smallest bedroom. She's fairly content; as long as she has a soft, cushy place to lounge and her beloved purple mousie, she's happy. In previous apartments, she's had the run of the rest of the house. I'm thinking that next weekend, I should make one more try at letting them both explore the house. If it doesn't go well, I was thinking that Harlee should be in the bedroom with me, and Zara should have the run of the rest of the house. One problem might be that the bedroom is already "Zara's place," and she is VERY territorial. Next weekend is a good weekend because it's a three-day weekend for me, although I have some places to go. I must find the full bottle of Zara's meds because they help. Comments? Suggestions? Thanks.