I had this operation forty-plus years ago, and recovery was easy as long as I didn't overdo physical stuff. I don't know what your particular diet is, but the operation shouldn't require any changes. As for dogs and cats wanting to get on your lap, put a big cushion or a pillow on your lap as soon as you sit down so they can't access it, and if they grizzle, tough, they can get back on your lap when you have healed. Make sure they have comfortable places to lie on as an alternative, and unless they tend to dispute over food, when you go to sit down, toss a tasty tiny treat on one of the beds allocated for them.
Your bedroom arrangements sound ideal - just remember to keep the door closed whether you are in there or not, so animals can't sneak in.
You will feel SO MUCH better once you have had this, and recovery goes at whatever speed it goes. I was back on a horse after four weeks, which with hindsight was risky and stupid, but luckily for me there were no ill effects. Be more sensible than I was and allow plenty of time for your recovery. Don't buy any new clothes (but you can research some) until the swelling round your tum has gone down.