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Start with a 2 by 2 feet (0.61 by 0.61 m) square, and thoroughly coat it with water. Don't spray a large area yet, as you'll need to practice a bit to get the technique down. Let the water soak into the wall for a few minutes. The water will help make it easier to scrape the texture off.  Touch the wall to see if it's soaked in enough. It should feel a little soft. If it doesn't seem soft, try spraying it again. Set the blade against the wall. The blade should create a 30° angle coming off of the wall. Keep it steady at this angle when you begin to scrape. Scrape the wall at an angle, adjusting as you go. You may need to scrape harder or softer, depending on how the wall responds to your scraping. That's why you're starting with a small spot first. If the texture isn't coming off, you're not scraping hard enough. However, you don't want to scrape down into the wallboard underneath. Once you get your rhythm, spray another section. It can be bigger than your first section. Let it soak in, and scrape it as you did before. Keep moving around the room until you've scraped all of the texture off.  Be sure to move systematically around the room so you don't miss any spots. Pick a place to start, and make a plan for how you're going to cover the whole room, such as going up and down the wall. If it dries out, apply more water as needed. After you have the whole room done, go back around with a medium-grit sandpaper in the 60- to 100-grit range. Sand down any rough spots that are left behind so you have a mostly smooth surface.  You can also use a sanding screen. Don't sand too hard, as you don't want to sand through the paper on the wallboard or into the wallboard. You don't want to leave dust on the area, so dampen a large sponge. Wipe down the wall as well as you can to remove the dust. You may need to wash the sponge out from time to time. Use a wallboard knife that's 6 inches (15 cm) long to spread joint compound across the wall. Aim for a layer that's 1⁄8 inch (3.2 mm) thick. Smooth it out as you go, and make sure to complete each wall in one session to give it a more even look. Let the wall dry overnight. Once the wall has dried overnight, sand down any rough areas with medium-grit sandpaper or a sanding screen. Create as smooth a surface as you can. Vacuum up the drywall dust so it doesn't float into the joint compound when you apply it again. You can use a standard vacuum, but make sure it works really well. However, you can also rent a dust drywall vacuum specifically for that purpose. Use your wallboard knife to apply the second and final layer of joint compound. Make a thinner layer this time, as you're mostly trying to fill in low spots. Let it dry overnight. After the joint compound has dried overnight, spend time smoothing out the walls again. Run medium-grit sandpaper over any rough areas to create a smooth surface. Vacuum up any dust. It helps to wipe the wall down with a damp sponge again, letting it dry afterwards.

Summary:
Spray a small area with water. Hold a floor scraper or drywall blade at a 30° angle. Scrape off the texture. Move around the room in small sections. Sand down the texture that's left behind. Wipe down the wall with a damp sponge. Apply joint compound over the wall with a wallboard knife. Sand the walls down again. Apply another round of joint compound. Sand again.