Okay. Don't panic. Dave here, with another tip of the trade. Paint spills, how to handle. Do you still have your plaster tools around from doing the patches on the walls? You can scoop it up as if it was a dustpan. In fact, a dustpan will work too, but these are very convenient, very nice. Just scoop as much as you can quickly. And the rest, you have your rags. Always have rags handy, a couple of rags, anytime you're doing a paint job. Scoop up the big parts and rotate the rags. If it's a hardwood floor, lots of water, clean rags, and when you get down to the end of it, clean paper towel. If it's an oil based paint, you're going to need some paint thinner or mineral spirits.
You need to put that down, and scoop that up again, and keep cleaning it with a clean paper towel or clean rag and you'll be okay. If a big can of white paint spills on your new red carpet, I don't know what to tell you. That's going to be a tough one. But always be prepared, and you'll be fine.