All I can tell you is dive in. I did it on my 1st 95 850 with regular combo wrenches. You are ahead of the game; you have the right wrench. I just got underneath(AFTER JACK STANDS WERE IN PLACE!)and followed the wires to their respective plugs. Use PB blaster to get the old ones out and make sure to use the goo that comes with the new sensors. You may also want to go a tad to the right and then unscrew the sensors. How did you come to know the O2 sensors needed replacing; yes - 200K miles is a good indicator but you may want to go to Autozone and let them put your brick on their scantool (free). I will be moving the O2 sensors from my old one, which is wrinkled (17 year old daughter + Cherry tree at 55 MPH = Thank God she was in a Volvo), to one I just picked up in Chicagoland and drove to NJ.
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