Internal cornor advice

[Crumbs]

Hi, another newbie question. I am tiling a bathroom. On internal cornors, it was my understanding that you leave a gap where tile meets the wall by the same amount as your grout lines (3mm in my case). Then the same on the wall next to it then silcone.

Tho when i dry fit them, its impossible for me to leave a 3mm gap on the adjacent wall because the back wall tile is in the way. The adjacent tile sits out past the end of the main wall tile as its 10 mm deep. Do we do 3mm gap away from the opposing tile i presume then? Or should i be cutting the tile back more. Apologies for the basic question thanks a lot

 

[Dumbo]

Not quite sure what you're saying but getting general drift . Measure first tile to wall leaving gap then second tile to the first tile .