150cm X 25cm ceramic tiles - how to cut them?
Wet tile saw



The best way to cut straight lines is to use a wet tile saw. This gives you a nice clean line, and is safer and significantly less messy than a dry saw because the water keeps bits from flying everywhere.

Snap tile cutter



Another option is a snap tile cutter. This scores the tile and then you can snap it easily. It doesn't produce as clean of cuts as a wet saw so it's an ok option if you are hiding the cut edge under baseboard at the edges of the room. 

Tile nipper



Another option is a tile nipper. These are only for cutting small pieces, doing detail work or cutting curves. They literally nibble a way a little bit at a time.