Do what dude said.
Tape cheap painters plastic to all walls about a foot down from the cieling.Make a bag of the whole room. When the room is not too hot go into the bag with a mask and hood and junk clothes and scrape the stuff off or get someone to do it.Have a sponge and a bucket of water to wipe the ceiling clean of residue. Roll up the bag and get rid of the hood,mask, sponge and clothes too. There is no mess beyond that.
I am not saying to do that if asbestos is present, or might be present, but I would.
