How to change spark plugs in 2005 chevy silverado ?

Half of the plugs will be on the left, and half on the right of the engine. You will find a cable going in between the exhaust heads, those cables go to the plugs.

Use a plug puller to reomve the caps with out damaging them,

then remove the spark plugs with a socket designed for spark plugs, then verify the proper gap on the new spark plugs

install the new plugs,

place the caps back in the same spot they came from

the caps should make a clicking noise if they seat right.