Some useful information from the point of view of the effects of changes in the cats' environment.
Having trained dolphins, dogs and cats,know that animals are smart enough to reverse the plan - sometimes they trained me.
Nice Things for Good People
Your Cat: Simple New Secrets to a Longer, Stronger Life, by Elizabeth Hodgkins
This is the best book about cats, and it is always the one we recommend first.
Structure in Adtion: The Makings of a Durable Dog, by Pat Hastings
Primarily about dog structure, it is applicable to cats, and this is the best book I have found on the subject of general form and function, because there isn't anything written specifically for cats.
Make sure your cat is physically comfortable doing agility. Read this book to develop your eye for evaluating structure.
Calvin & Hobbes, the complete set.
I am smiling while typing, just thinking about this cartoon series. My favorite.
If you don't already know Calvin & Hobbes, give yourself a treat and get this complete set. You deserve this much happiness.
Watch the cats while you are away from home, on your cell phone.
This is a good book on behavior insight, especially about the importance of interactive playtime and bonding, stressing to never punish, grumble, or emit any sort of negativity your cat will feel, because they won't understand it.