Remove or cover furniture, floors, vents, and outlets
Turn off power to the room if needed
Test the wall texture for paint and texture type
Spray the wall lightly with water if the texture is water-soluble
Scrape the texture off with a wide putty knife or drywall scraper
Use a pole sander or sanding sponge to smooth remaining bumps
Apply joint compound to fill low spots and imperfections
Let the compound dry completely
Sand the wall smooth
Apply a second coat of joint compound if needed
Sand again until the surface is even
Wipe away dust with a damp cloth or vacuum
Prime the wall before painting or refinishing
Use a texture removal chemical or heat gun only if appropriate for the material
Wear a dust mask, goggles, and gloves
Repair any damaged drywall before finishing