I changed 7 of the plugs from under the car......#2 plug I change from the top....Thats the one under the alternator....I didn't use any special sockets of swivels, just a few different length extensions......I didn't mind doing them but hated changing the wires. Take your time and take a break if you get angry

 

Do I need to replace the Opti and gamble that I get a good one, or just leave my stock one on there?