Will this work for me? We are buying a 50's home w/ a blunder ceiling in the living room. It seems they tried to cover some water marks w/ something spread it around and then stopped. We've heard of textured paint, but info from Home Depot brochures make it sound like an art. We also don't like popcorn ceilings if we can avoid it. Any suggestions? And do we need to sand first w/ a textured paint?