What does the speaker propose to do with the big sofa?

The speaker proposes to seek help with the big sofa because moving large furniture often requires assistance to avoid injury and ensure it is transported safely. By deciding to get help, the speaker acknowledges the challenge of moving a bulky item and recognizes that completing the task alone could be difficult. This approach not only promotes safety but also implies teamwork, which can make the task easier and more efficient. Seeking help is a practical solution to the problem of moving a big sofa, as it leads to a smoother process and less risk of damage to the sofa or injury to the mover.