In order to tile around a window you have to spread thin set on the wall by using a notched trowel.
Tiling a bathroom wall with a window.
That way you can make sure the grout lines of the recess are on the same plane as the wall.
You shouldn t need to cut the tile unless it is an end tile that completes the row.
With the sill in i can tile the sides of the window.
This will allow you to leave room for the adhesive that will secure your tiles to the wall.
Use bullnose tiles to round off the edges of the window frame and tile the wall first.
Then measure around the window as to cut the tiles with a score and snap cutter or a wet saw to fit into location.
Another thing i offer my clients is a shampoo niche.
When tiling bathtubs backsplashes and other areas that use limited quantities of tile buy the best quality tile you can afford.
Place a tile against the wall and add a tile spacer to the side of it.
Line up a tile with the edge of the window and protruding out over the full sized tiles on the wall.
Mark the tile where it overlaps the full sized tile and number it on the back side.
In a bathtub area the cost difference between using this cheap bland 0 69 tile and a better quality 4 75 tile is negligible.