Need instructions

There really aren't any instructions. You just wipe the hole clean and pound in the new core plug. I like to add a bead of silicone gasket sealer to the outer edge but it isn't necessary.

Check at the auto parts stores that rent or borrow tools to see if they have the tool kit for core plugs. It will have the right size disc which will prevent you from pushing the plug in too far. They have straight handles, and curved handles for working around obstructions. The store will have listings too for the core plug so they can give you the right size.