I just painted a popcorn ceiling in my livingroom that I did not notice cracks in before I painted it. After looking at the ceiling feeling quite pleased at the way it came out, I noticed cracks in the ceiling. upon touching one of the cracks a piece the size a quarter came off in my hand. I have painted all of the popcorn ceilings in the upstairs portion of the house with no problem. I would really like to repair this if I can. I can't afford a professional, or can I not afford to leave this one to a pro? HELP!