How do you change spark plugs in 96 GMC van?

To change the spark plugs in a 1996 GMC van, first, ensure the engine is cool and disconnect the battery. Remove the ignition wires by gently pulling them off the spark plugs, then use a spark plug socket and ratchet to unscrew the old plugs. Check the gap on the new plugs, install them by hand to avoid cross-threading, and tighten them with the socket. Finally, reconnect the ignition wires and the battery.