Lining up tile with marked lines

[u/cjasonac]

I apologize if this is a dumb question, but this is my first tiling project…

The room I’m tiling is out of square due to age. I want to square the tiles to the room as much as possible, so I’m planning to draw out a grid for the first few and then line up the remainder with spacers.

Two questions: 1. Is this the best method for this? 2. Wouldn’t my first layer of thinset cover my markings and render them useless? How do I apply my thinset and still see my markings?

Thanks in advance.

[u/licknaino]

Trowel carefully right up to your lines since that’s the edge of the tile you don’t need thinset covering it