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There should be no particle board in the floor of a bathroom. That was a building error. I have never seen that on the hundreds of building sites I have been on. They are almost always fibre cement sheeting where the wet areas are.
So step 1 would be a demo and remove the incorrect particle board and as suggested you better check how extensive the water damage is - how far has it travelled.
Tiling is something I have done myself several times and is not that hard really. The main thing is to have good tools and to make sure you level the tiles so some are not sitting up. They are usually easy to cut so do your layout then do a smallish area and the little plastic spacers to get the gaps even. Doing around a drain may take a bit so google that or look at how they are done in bathroom displays in tiles shops.
Reuse existing plumbing and electricals if you can. You can get a nice glass shower these days for $900. I saw one just the other day at a glass shop in McGraths Hill.
Have fun with it. It can be fun.
Greg.
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