Go bilats!
At four months out, I am very pleased I did two in a week. I feel pretty normal now and am counting the days until those final restrictions are lifted and I can once again squat, lift more than fifty pounds, cross my legs, and, most of all, RUN. If I had done them separately, I would be looking forward to another surgery and recovery, not to normal life.
It is tough that first week, you will need help, but then it gets better. You figure it out and become more independent. And I will add that if you are bad enough off to need both hips done, you really don't have a good leg to rely on if you do them one at a time.
What do you do for a living? How much standing and walking do you do? I felt mentally clear at two weeks and could do sitting down work. I could walk and stand quite a bit at six weeks, but I didn't have work that required me to do that. I did need a cane at six weeks....was thinking of dumping it at eight-ten weeks, but didn't really leave it completely behind until twelve weeks. You are younger and may be in better shape than me.
I agree with Kingrob on the 90 degree rule. It isn't an issue at first because you don't want to bend. The last two weeks you want to, but are tight and stiff enough to be reminded not to. When you see Dr Gross, ask him exactly what you can't do; he is more lenient on some of those 90 degree related restrictions. (He is also very tall fwiw.) To get ready, yeah, get that toilet riser and claim your bathroom. Also put up higher the things you will need the most: food in the fridge you eat most, clothing you will wear most, remote controls and electronics (and the extension cords, if needed). You can more independent if you move the things you need within reach.
Good luck! I am excited for you to do this and get on with your life. Instead of getting worse and worse, you will be getting better and better.