How do you change the spark plugs on a opel kadett?

To change the spark plugs on an Opel Kadett, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the spark plug wires carefully, labeling them for reinstallation. Use a spark plug socket and ratchet to unscrew the old plugs, then install the new plugs by hand to avoid cross-threading, tightening them to the manufacturer's specifications. Finally, reconnect the spark plug wires and the negative battery terminal.