How do you smooth a textured wall?

To smooth a textured wall, start by sanding with a coarse sandpaper (such as 80 grit) to remove the irregularities. Then, work your way to a finer sandpaper (120 or 240 grit) to create a smoother surface. Make sure to apply even pressure and sand in circular motions. After sanding, dust the wall off and apply a primer before painting for the best results.