Not so long ago I moved to a new house, it was my dream. The renovation was done in 5 months, I think pretty quickly. I was lucky that my cousin was a builder, he knew where to buy materials, for example, he bought a plasterboard at https://www.mgnbm.co.uk/plastering-drylining/plasterboard-coving/, and in general he bought a lot of necessary building supplies in this store. So don't be afraid to make repairs.