Cut through the tile using an angle grinder.
How to cut tile on shower wall.
Start at one end of the cut line and run the blade along the tile surface to the other end.
Push your tile firmly into place.
You could use a score and snap tile cutter or a wet saw with a diamond blade.
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.
Use bullnose for exposed edges or you can use trim pieces.
Use spacers between the tile to make sure the gaps are consistent.
For exposed edges set edge trim or bullnose tile pieces in place.
Use a tile cutter to just score the length of the tile and press firmly to cut.
Set the depth of the blade to 1 4 inch.
Once only the bottom row is remaining remove the support board.
Cut as needed with tile snips or a wet saw to allow tile pieces a better fit around shower faucets and shower heads.
Getting stuck and not having an answer well that s my biggest fear.
Cut away large sections or large cutouts with a handheld circular saw equipped with a tile cutting stone blade.
You can buy a 3 or 4 carbide hole saw but they are super expensive.
Make multiple passes with the blade if needed to cut through the tile and to the subsurface.
Periodically check the tile line with a level to be sure they are straight.
Use tile nippers or a hole saw designed for tile to cut curves.
Hold the saw up to your marked lines.