Remove the black plastic cover on top of the engine and follow the wires to the three spark plugs on each side of the engine. Use the appropriate spark plug wrench to remove the plugs one at a time (don't remove all the wires off at once, just one at a time). Use a plug gapper to gap the plugs. Put oil on the plug threads and put them in hand tight and then torque to the proper tighntness - be carful not to cross thread when putting the plugs in (world of hurt and embarassment).
That said, you could probably go another 30,000 or 40,000 miles with the current plugs and reconsider the cost of installation then.
Hope this helps.
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