How difficult would this be to restore myself and how would I go about it? Sections of tiles are loose, some are missing and others are chipped. Where can I source original replacements? There is adhesive on many of the loose tiles. Would I be able to angle grind this off? I was thinking of attempting to fix the tiles myself and then pay for it to be cleaned and sealed. I did get a quote from a specialist but it was far more than I was expecting. Any help and advice appreciated.