Use Easy Pack garbage bags with handles or Power XXL garbage bags to protect floors, light fixtures and other items from paint in the area where you are working, like this:
Extra bonus: to keep the container where you put the paint clean, you can use SANITAS garbage bags for small bathroom bins. Place the bag in such a way that it covers the container and then pour the paint you’ll be using into the bag. When finished, remove the bag and your container will look as good as new.