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1) I ended up using one sensor from AutoZone and one from O'Reilly's. (AutoZone only had one.)
2) I replaced both even though the Bank 1 (front) sensor looked brand new. I didn't replace the harness, mine was fine.
3) I just disconnected the cruise control and throttle from the throttle body and unbolted the brackets holding them on and laid everything aside.
4) Go ahead and get the disconnect tools. I believe you'll need a 3/8" (supply line) as well as a 5/16" (return line) tool. I got mine from O'Reillys from $3 a piece.
5) The way I relieved my pressure was by pulling the fuel pump relay from the fuse box under the hood and I started the motor and let it die. (might toss up a SES code but you'll have no pressure in the lines when you disconnect the lines and you can clear the code.)

I just did this a couple of weeks ago and it took me about 6 hours from start to finish. It's not too difficult, just time consuming. Good luck.
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