How can I achieve a smooth finish when sanding joint compound on my walls?

To achieve a smooth finish when sanding joint compound on your walls, start by using a fine-grit sandpaper and sand in a circular motion. Be sure to feather the edges of the compound to blend it with the wall. Sand lightly and gradually increase pressure as needed. Wipe the dust off with a damp cloth and apply a primer before painting for a flawless finish.