Use bullnose for exposed edges or you can use trim pieces.
How to cut tile on shower wall.
Set the depth of the blade to 1 4 inch.
Use tile nippers or a hole saw designed for tile to cut curves.
Hold the saw up to your marked lines.
You could use a score and snap tile cutter or a wet saw with a diamond blade.
Once only the bottom row is remaining remove the support board.
Periodically check the tile line with a level to be sure they are straight.
If your shower pan is not level then the level line you created to mark the top of the first row will mean that some of your tiles need to be cut.
Cut as needed with tile snips or a wet saw to allow tile pieces a better fit around shower faucets and shower heads.
Use a tile cutter to just score the length of the tile and press firmly to cut.
Cut through the tile using an angle grinder.
Push your tile firmly into place.
For exposed edges set edge trim or bullnose tile pieces in place.
Spray water onto the tile when needed to keep the surface wet.
Make multiple passes with the blade if needed to cut through the tile and to the subsurface.
This tends to happen when homeowners need to cut a large hole in tile.
Cut away large sections or large cutouts with a handheld circular saw equipped with a tile cutting stone blade.
Start at one end of the cut line and run the blade along the tile surface to the other end.
Use spacers between the tile to make sure the gaps are consistent.