How do I change spark plugs in a 1999 Chevy 6 cylinder Venture van?

don't know where spark plugs are located in this vehicle. Any info would be graetly appreciatedHow do I change spark plugs in a 1999 Chevy 6 cylinder Venture van?the plugs are located below the valve covers on both the front and back side of the motor. You can change the front ones from the top. just make sure the motor is cool. the back ones can be changed easier from the bottom. cannot really access them from the top.