M
Mr Tiler
the ceiling doesnt have to be level bud, just do a point to point cut i.e, turn the tile upside down offer it up to the ceiling and mark it 3-4 mm short of the last course of tile. mark the tile at each end at each point the tile will sit. bit hard to explain would be easier to explain in person.... but if the ceilings that wavey you can mark it at both ends and in the centre of the tile. you have to scribe it twice but i do it all the time and it works a treat. hope this helps ya