As a tiler, it looks pretty good to me in 'setting out', i.e. It's all lining up and square. My only advice is to have a clean bucket of water with a sponge handy at all times. You need to clean the joints as you go otherwise you'll be scraping out the dried up adhesive. Well done though!!

Wow looks great. Cool bathroom!

Don’t be to hard on yourself mate, it all looks good. Keep going 👍🏻

It appears from the look and from the difficulties that you were having that your mortar was very dry. You start with poor adhesion and it just goes downhill from there. I feel your pain. Tile work is tedious and relies on so many different factors. You keep saying you're not a tile guy, but your cuts are clean and your lines are level and square. I've seen pros do worse. I wasn't there, but it really appears that your mud was too dry. No offense, mate, but that is looking like one dreary room. I hope you are planning a very light grout to help it pop! Nice work. You should be proud of what you've shown us.