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Might try and do the walls ourselves.
Stripping the wallpaper seems straightforward enough. It might lead to some small chipped bits of plaster like in that picture at worst but can just stick some filler and sand that and it'll be fine, right?
Not sure what the mould treatment is like but I suspect a little chemical wash is all it needs and then we just bang on some paint.
Andy/Bam/other alphas, can I do this shit easy enough or do I need to enlist some Albanian motherfucker off Nextdoor?