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I think the biggest thing is be prepared to strip more back than you expect... I had not anticipated going back to joists to get all the rotten/mouldy wood out. I hear this sort of surprise isn’t uncommon.
Other than that it’s lots of small quite specific things - weird waste pipe sizes, corroded brass fittings that refuse to re-seal properly, tiling round the edges being a total PITA when done after the middle, getting the right sealant for the job, etc
Edit: oh and if you’re having a walk in shower with flappy glass panel, go longer on the main panel than you think (and work out where the shower head will be).
Thanks. Are there any particular things I need to watch out for?