How do you change spark plugs on a Suzuki carry van y reg?

To change the spark plugs on a Suzuki Carry van (Y-reg), first ensure the engine is cool, then disconnect the negative battery terminal. Remove the ignition leads or coils, and use a spark plug socket to carefully unscrew the old spark plugs. Install the new spark plugs, tightening them to the manufacturer's specifications, and reconnect the ignition leads or coils. Finally, reconnect the battery terminal and start the engine to ensure everything is functioning properly.