How do I remove a popcorn ceiling?

Here are a few tips. Hope it helps. https://www.familyhandyman.com/drywall/ceiling-texture/how-to-remove-a-popcorn-ceiling/

If it's not painted you can wet down and scrap it off with a wide putty knife. If too difficult you can cover it wirh 1/2" drywall screwed into the ceiling joists.

Even if it is painted, like a wallpapered and painted wall you can use a scoring tool to make scratches in the surface and spray it with warm water with a little fabric softener in it and then scrape.

Fabric softener softens paint, paper, baked on foods and grease when used to soak. You can use softener sheets to remove the scorch off your iron plate by ironing the sheets.

Step 1: Test for Asbestos

If your home was built before 1980, there's a chance that the popcorn ceiling contains asbestos. You should hire a professional to test the ceiling. If it contains asbestos, you'll need a licensed asbestos abatement contractor to remove it.

Step 2: Prep the Room

1. Cover everything: Remove all furniture or cover it with plastic. Lay down drop cloths or tarps on the floor and tape plastic to the walls to protect them.
2. Turn off the power: If you have light fixtures on the ceiling, turn off the power to the room to avoid any electrical hazards.

Step 3: Wet the Ceiling

1. Fill a spray bottle with water and lightly mist the ceiling, focusing on a small section (about 4x4 feet) at a time. Be careful not to soak it, as too much water can damage the drywall underneath.
2. Let the water soak for about 10-15 minutes to loosen the texture.

Step 4: Scrape the Popcorn

1. Use a wide putty knife or drywall taping knife to gently scrape the popcorn texture off. Hold the knife at a slight angle and carefully work across the section.
2. Be patient and work in small sections to avoid gouging the ceiling.

Step 5: Smooth and Sand (Optional)

1. Once the popcorn is removed, you might notice imperfections or small gouges in the ceiling.
2. Sand the ceiling with fine-grit sandpaper to smooth it out.
3. Patch any gouges with joint compound, let it dry, then sand again for a smooth finish.

Step 6: Prime and Paint

1. After the ceiling is smooth and clean, apply a coat of primer.
2. Once the primer is dry, paint the ceiling with the desired color.