I am a Dr. Su simultaneous bilat patient 6 months out. I am happy I did the bilateral. As a bilateral patient with Dr. Su, you will be an afternoon surgery and you'll spend the first night in the recovery room. I spent 4 nights at HSS. They had talked about sending me home a day earlier, but I just was not ready. Went home from HSS (note that I had posted a question on the forum prior to my surgery about whether I would need to go to a inpatient rehab after the hospital.) Well, the rehab facility was not needed, but it did put a burden on my wife - especially for my first week home. Make sure you have someone around for the initial days home.
Get a toilet seat riser, just to make life easier. I also rented a hip chair, which was helpful for me to sit at the table for dinner. BTW, I am 6'5", 225lbs so chairs and toilets seemed very low. The grabber helped a lot as well. You can get around on crutches when you leave HSS, but it is hard to carry things (like a glass of water) - so I used one of the cups with a straw built in.
I didn't drive until after my one month appointment, which was just about right for me. After three weeks of at home rehab (mainly walking and initial stretches) I did outpatient rehab for a 10 to 12 weeks. I had no limp coming off the crutches. However, I still do "the shuffle" when I start up after sitting or driving for a couple of hours.
I would recommend you start a regular rehab type exercise program in the next several months, prior to your surgery - it makes the recovery all the faster. Of course I needed some painkillers to be able to exercise prior to the surgery, but it was very helpful in the long run. That being said, don't be afraid to use the painkillers after the surgery either.
If you need more info, or specifics, feel free to just reply or PM me. Dr. Su and his team do quite a few simultaneous bilaterals. You're in good hands with them, if that is what they recommend.