Take the plastic engine top cover off, remove the four 10mm bolts holding on the coils & the two 10mm bolts holding the wiring rail on. Unplug the coilds from the wiring harness & remove them. Use a spark plug socket (has rubber in it to hold the spark plug) & extension to unbolt & remove the plugs. Its pretty deep because of the dual overhead cam. Remove the old plug from your socket, put a new one in it & then use the extension to reach it to the hole. (Do not drop the plug down the hole). Take one of your new plugs with you to buy a spark plug socket.
Hope that help, good luck.