Start scraping the ceiling surface and continue around the room. If you’re feeling particularly handy, HGTV has a great tip to tape your putty knife to the nozzle of a wet/dry vacuum so that what you scrape off is immediately vacuumed up, which will seriously minimize your mess.
After removing all the texture you’re able to scrape away, you’ll want to sand down the ceiling so that it’s smooth to the touch before priming and painting the entire surface. It might be a time-consuming and difficult product, but all that work will surely be worth it for a smooth, textureless ceiling that not only will look better, but will also add value to your home.