How to replace and fix a UK moulded plug for your gadget

Walk-through guide on how to replace a broken or not working moulded plug gadget.
Replacement plug here amzn.to/3eZhLNd
Wire stripping tool (cheaper and easier to handle than one shown) amzn.to/2TEYhGm
Screwdriver set for removing plug (but flat and cross head screwdriver would do)
amzn.to/3zDckLW
Earthing sheath (if needed) amzn.to/2WnPnOr