I’m not an experienced tiler, but I do know something about cutting metal.
You can use a pair of straight cut aviation snips. They will cut easily and cleanly. The only problem might be if the tile is embossed with a pattern. The cutting process will tend to flatten the relief along the edge of the cut.
Alternately, you can use a very fine tooth hacksaw (32 TPI) to cut them. Clamp the tile to your workbench, between wood blocks so it doesn’t move around. Then use a fine file or sandpaper to smooth the edge. When you’re working on metal it’s a good idea to wear eye protection and a pair of gloves. Hope this helps.

you can use sheet metal shears