The hardest part is sitting up for hours at a stretch. Even though my surgical wound is fairly high on my abdomen, sitting in a desk chair (or a car seat) is very difficult still.
By the same token, I'm not driving yet. I can't handle the seatbelt without a pillow between my wound and the belt. Also, I don't trust my reaction times and situational awareness yet.
Still, I am better each day. And more to the point, I feel better.