Use a long straight batten levelled with a spirit level to find the lowest point.
Tile is level wall is not.
It is extremely important to level the surfaces.
The way i would approach this would be to get your top row correct and level then work down to the floor.
How to tile an uneven wall.
Now using a level make a line on your wall all the way around the area you ll be tiling.
The horrible gap between this ceramic tile and the wall is not normal.
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It s really important to start laying your field tiles so the faces are level.
The back of the tile should be flush with the wall.
That way any warping of the tile out of level occurs lower on the wall where it is not so obvious as at the top.
Take the tiles to the tile saw and make all the cuts.
Once you reset the tiles you need to.
They may have settled or bowed over time or the plaster may be rough and uneven.
If you re tiling over an uneven section of wall the.
Create a rough surface to improve bonding.
If it s straight you can use it to align your tiles instead.
If not you can level the surface using a grinder sander or a tile level system.
And specifications so each contractor would know the level of quality.
Fixing whole tiles to a wall.
If a wall tile is uneven the mastic holding it in place was not spread properly.
The other alternative is to run the wall tile doewn behind the floor tile with a 90 degree corner there.
If not it s time to get cutting those tiles.
Many walls are somewhat uneven.
The existing surface needs to show some sort of roughness that will facilitate the bonding between the new adhesive and the old surface.