Trim and lay edge and corner tiles when you need to trim a tile before you lay it put the tile in place on the wall mark your cutting points and use a tile cutter or angle grinder to trim the tile to size.
How to lay wall tiles in a corner.
Mark on the wall where the last tile would end and using a spirit level draw a line to the ceiling.
When tiling any wall you want the cut tiles in a less visible area than the whole tiles.
Press the tile against the wall with the cut side facing the corner and the other edge next to the last full tile in the course.
Installation of corner tiles is the same as it is for wall tiles.
Step 4 lay the full tiles.
Treat each wall individually rather than trying to tile the room as a whole.
As you can see in the image you should place spacers along the inside corner and between the tiles.
As you work your way up from the bottom you smear your thinset onto the wall with a notched trowel depending on the size of your.
Therefore you should spread tile adhesive on the wall with a notched trowel and install the tiles.
After you have finished installing tiles on one side of the internal corner you should continue by laying tiles on the other side.