O2 sensor, 80Q - dumb question

[Tessie McMillan]

I know this is going to seem like a dumb issue, but here goes:

I have my new O2 sensor and I need to install it this week. When my exhaust
was being replaced and they had everything sawed off, I could see the inside
portion of the old O2 sensor sticking down into the the pipe in front of the
cat. I couldn't see where the top of the sensor is, and the Bentley doesn't
help much. It shows the exploded diagram of the exhaust and the O2 sensor
seems like it is on top of the pipe to the catalytic converter. I can't see
anything just by looking under the car without jacking it up.

How do you find the O2 sensor? Does anything need to be disassembled? I'm
trying to figure out if I could get at it by jacking up the front of the car
or one side of the car. I'm also wondering if the exhaust has to be cold to
do this.

Thanks, and apologies for sounding so dense.

Tess
Seattle WA U.S.A.