I think you would have to turn off the breakers in your panel so that only a few circuits were active.
Also I was without power for four days in July a few years back. While I had a 6500W generator, its job was to run the refrigerator and a large chest freezer, the microwave occasionally, plus some smaller appliances like box fans and a cell phone charger. I just got some long heavy-duty extension cords, cost under $100 for four. Dirty clothes got washed and rinsed in the bathtub and dried on a clothesline in the backyard sun.