Get yourself a 5 inch solid flat scapper, scape of the nibs and bits. when your happy with that buy yourself a caulking board, a bag of Easy Fill and a filling knife. Get yourself a flat bottom bucket or painters kettle and mix up the easy fill with water(not too wet, quite thick) and with your caulking board skim it over the ceiling, may have to skim it 2 or 3 times.
Gary Bishop
January 2008