How do I paint a room the right way?

Short answer

Clear and cover the room, wash and patch the walls, prime any repairs, then paint in this order: ceiling first, walls second, trim and doors last. Cut in along edges with a brush, roll the open wall while the cut line is still wet, and put on two thin coats instead of one heavy one.

What you need

A 2 to 2.5 inch angled sash brush for cutting in
A 9 inch roller frame, an extension pole and covers (3/8 inch nap for smooth drywall, 1/2 inch for textured walls)
Drop cloths, a paint tray or 5 gallon bucket with a grid
Spackle, a putty knife, 120 to 150 grit sanding sponge
Painter's tape only where you truly need it

Step by step

Move furniture to the middle and cover it. Take off outlet and switch covers.
Wash greasy or dirty areas (kitchens, hallways, around switches) with a mild degreaser and rinse.
Fill nail holes and dings, let them dry, sand flush and wipe off the dust.
Spot prime patches so they don't show through as dull spots (called flashing).
Paint the ceiling first so drips land on walls you haven't painted yet.
Cut in one wall at a time: a 2 to 3 inch band along the ceiling, corners and trim.
Roll that wall right away in overlapping 3 foot by 3 foot sections, working top to bottom, so the roller blends into the wet cut line.
Let the first coat dry to the recoat time on the can, then repeat.
Paint trim and doors last with a semi-gloss or satin enamel.

Mistakes that show

Stretching paint too thin to save a trip to the tray. Keep the roller loaded.
Letting the cut line dry before rolling, which leaves a visible picture frame around the wall.
Painting over glossy or dirty surfaces without cleaning and scuffing first.

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Updated September 2026. Always follow the directions on your product's label; manufacturer instructions come first.