Recently posted a couple of questions in here during my cloakroom
decoration.
Thought I'd post a few observations.

Good tips I picked up along the way:-

SDS drill was great for removing tile cement.

I bought a cheapo £25 Plasplugs diamond wheel tile cutter
- a recommended bargain
Cuts porcelain tiles a treat.

Use a crayon to mark your lines, preferably one that contrasts in
colour to the tile - shows up in all the water like Moses parting the
red sea.

Cutting holes in porcelain tiles however, is a complete *******. Not
so easy even with a diamond tipped bit.

I used Schluter Ditra matting directly onto floorboards as a substrate
beneath my porcelain floor tiles instead of marine ply / concrete
backer board etc. Not recommended method by the website but
recommended by my local tile shop. Seems to have worked very well and
no step-up as you walk into the room.

Flexible soil pipe pan connectors are a pain, dunno why but mine kept
slipping off the loo. Junked it in the end and bought an elbow.

Check the area under new sinks or bidets where the waste goes as soon
as you get them. It's a pain to get a new one some months after
purchase. I had a poor finish under my bidet and had to resort to LSX.

Wastes meant for Designer 'chrome' bottle traps may not fit an
ordinary plastic bottle trap.