You'll be fine. It just isn't that difficult after surgery. I had an open procedure with a 7 inch incision and I don't know how many staples they put in there or how many stitches they took inside my body, but I could have immediately gotten up and gone home after the surgery, except for the nerve damage that radiated from my navel to my left lower abdomen. That should not happen with the surgery, but it did happen to me. It's very unusual to have the kind of pain I had. It took me a year or two to stop having nerve pain.
Of course, you might have more pain or feel more pain than I did. It's kind of up to your own pain threshold. If you are having a laparoscopic procedure, you will have gas pain from the carbon dioxide they fill your belly with. After they stitch you up, the gas has to get out of your body and it can't go out the way it went in so it will literally go through your muscles and skin to get out, and it's a very uncomfortable process.
Nevertheless, you're having the sleeve which is really not a difficult surgery and you won't really have any problems around your house, even if you don't have help. I lived with a few people but aside from needing help to get out of bed because of my nerve damage, I didn't get a single bit of help from anybody else.