Remove all furniture and window coverings from the room. Lay tarps over the floor and items that remain in the room.
Sink loose or popping nails into the ceiling with a hammer. Press spackle into holes and other defects on the ceiling with a putty knife. Allow the spackle to dry for 30 to 45 minutes. Sand the spackle surface flush with the surrounding ceiling with 220-grit sandpaper. The repair does not require perfection; you will cover it later.
Attach a paint roller to a painter's pole. Pour a latex-based primer into a paint tray and roll a coat of primer onto the ceiling. Spackle achieves greater adhesion on a clean surface. Allow the primer to dry for one to two hours.
Pour powdered spackle into a large bucket. Add water to the powdered spackle and begin mixing it with a mixer bit connected to a power drill. Continue to add water and mix until the spackle is the consistency of cake batter.
Pour the watered-down spackle into a paint tray. Roll a paint roller, screwed on to a painting pole, through the spackle and apply a coat to the ceiling in a 4-by 4-foot section.
Submerge a slap-brush into plain water and wring out the excess. Dip the slap-brush into the watered-down spackle and knock off excess spackle onto the side of the bucket.
Climb a stepladder to access the ceiling and smack the slap-brush into the wet spackle, leaving behind an imprint. Continue to dip the slap-brush into the watered-down spackle, knock off excess and smack the ceiling until you cover the 4-by 4-foot section with a crow's-foot texture. Rinse the slap-brush in plain water as necessary to remove excess spackle.
Apply watered-down spackle to the ceiling next to the first textured section and repeat the technique. Continue applying the crow's-foot texture, section by section until you cover the entire ceiling.