I have to agree about the amount of time it takes for a cat to adapt to change. Not like dogs - a quick butt sniff, find the food and water bowls, and they are your best friend for life! Cats need to know it is all stable. I say this, and I've only really brought in younger cats!

With multiple folks involved, make out a schedule, include everyone's phone number, print and give to ALL of them. So they know what they have to do AND if something happens, they can easily phone someone else about changes.