Yes, one week for me, too. After the 3rd day home, I was fine for several hours in between "shifts" when people were stopping in to hang out with me. Mostly I just slept those first few days.
Early on it was most important for me to have someone there to watch how I was taking my meds. You are so spaced out that it's really important to have someone else there to keep you on track the first few days.
Brushing my hair was impossible by myself, but showering and other personal hygiene care was awkward, not a lot of fun, but totally independent the first day home.
Hard to know with a partial sternotomy if you will feel the same as those of us with a full. I really don't know that the heart itself feels any pain (does it, you guys??) but the mending of the broken (sawed) bone is the gripper.
It's the reaching, twisting, carrying, lifting that you don't even realize you do each day, every day to perform the most normal of tasks. Do not attempt any laundry for as long as possible. Reaching down and pulling and twisting wet clothes into the dryer...nope! Reaching over a sink to close a window...nope. Sliding doors.....nope. That bag of pasta way up in the corner of the cupboard...nope. The little pan for just one cup of soup way back in the lower right cupboard...nope. So I think you get my drift!!
Get things you will be using out onto the counter, or have someone else reach for it for a few weeks.
Best wishes.
Marguerite