Also tile is heavy so put down blankets to protect the floors and tub from being damaged by falling pieces.
Tiling uneven walls shower.
This will provide a straight edge for the tile to follow and help support it while it dries.
When you ended the tiles at the window why weren t they all cut evenly.
You could have wrapped around the edge w the tiles for a neater look.
You should have used the proper substrate for your shower walls.
I ended up going w a 1 thick basalt chair rail.
If the shower base is uneven tiles will have to be cut to fit the last row.
Things you will need measuring tape tile wet saw leveling spacers and wedges trowel thinset mortar rubber mallet grout grout float grout sponge.
You still may be able to do it by removing the last tiles and redoing it.
With the uneven ceiling level you would normally level or laser a horizontal line that runs around the shower enclosure at the top of the tile if leaving a top border tile free see below then measure your row lines down from there to the bottom and start with any bottom trip and cuts and actually place the tile from bottom up to the top.
Begin by removing the old tile or the fiberglass shower wall.
Find a matching thick chair rail edging 12 piece and you ll be fine.
Just get some chair rail molding or some type of 1 trim pieces.
Whatever you put there you are going to see the uneven tiles.
Mine is the same way because i used 3 4 thick tile on my wall.
Draw a leveled line where the bottom of the second row will fall.
If any part of that should get wet you could have some issues.