I just did this about two weeks ago.. follow the how-to to the tee, once you move the wiring harnest around some, I was able to slip the wrench by were the coil pack is and my hand between the harnest and the engine block on the left side (if you are facing the engine.) I found it easier to disconnect the sensor and slip the closed end of the 7/8 wrench over the 02 sensor. Once you break it loose a little, you can remove it with your hands. Hope this helps.
-Matt
