When lifting a wall section into position, the bottom of the wall can slip across the floor deck, and even fall off. If you are short on help, a solution is to position the section as it lays flat, then drive duplex nails (with two heads) through the bottom plate into the floor. The nails will bend as you raise the wall to a vertical position. After securing, pull out the duplex nails.
If you have pets, consider replacing the carpeting before putting your home on the market. Many people are allergic to pets and extremely sensitive to pet odors, which even a recent, thorough cleaning may not mask. And worn carpeting, even if it is clean, can detract from a home’s overall appearance, giving the impression it has not been well maintained.