Usually I'll set out by finding the centre line between the floor and ceiling and work up and down from there to see if everything looks ok. If not then I'll adjust up or down until I'm happy. It might be that a full tile off your floor works out well, but is your finished floor bang on level all around the room? If not then I'd suggest starting with a cut tile from the floor, even if it means taking just a few mm off but that way you can keep all you lines horizontal. Laser levels are invaluable for making this easier. I'd stack your tiles as opposed to brickbond.
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