Gather joint compound, drywall tape, mud pan, taping knives, sanding sponge, and dust mask
Cover floors and nearby surfaces
Check drywall screws and nails; drive any protruding fasteners below the surface
Fill gaps and deep holes with joint compound
Apply a thin coat of mud over seams and screw holes
Embed drywall tape into the wet mud on seams
Smooth the tape with a knife to remove excess compound and air bubbles
Let the first coat dry completely
Apply a second, wider coat of mud over seams and fasteners
Feather the edges of each coat outward
Let the second coat dry completely
Apply a third thin finishing coat if needed
Sand lightly between coats and after the final coat
Wipe away dust before painting or priming
Inspect for ridges, pinholes, and uneven spots
Touch up any remaining flaws with a thin coat of mud and sand again