Step 1: Remove engine cover.
Step 2: Remove left intake manifold side
5mm hex
Manifold side removed, metal gasket intact.
Step 3: Disconnect wire harness from coil packs.
Step 4: Remove coil pack.
Step 5: Remove spark plug with 5/8" sparkplug socket and 6" extender.
Step 6 (optional): Place anti-sieze on new plug threads.
..but not that much! I used NGK Iridium plugs.
Step 7: Install new plug, tighten to 30 N*m (22 ft*lbs). Repeat for plugs 2 through 4.
Step 8: Reinstall left manifold side.
Step 9: Unclip coolant hose from right manifold side.
Remove right manifold side, remove old plugs, install new plugs same as left side.

Step 2: Remove left intake manifold side

5mm hex

Manifold side removed, metal gasket intact.
Step 3: Disconnect wire harness from coil packs.

Step 4: Remove coil pack.

Step 5: Remove spark plug with 5/8" sparkplug socket and 6" extender.

Step 6 (optional): Place anti-sieze on new plug threads.

..but not that much! I used NGK Iridium plugs.
Step 7: Install new plug, tighten to 30 N*m (22 ft*lbs). Repeat for plugs 2 through 4.
Step 8: Reinstall left manifold side.
Step 9: Unclip coolant hose from right manifold side.

Remove right manifold side, remove old plugs, install new plugs same as left side.