1998 Ford Escort Oxygen Sensor

My engine light came on this morning. A salesperson at the auto store told checked and her PCM determined that a malfunction exists in the electrical circuit for oxygen sensor 2 in bank 1, which may be located in or after the catalytic converter. (Bank 1 identifies the location of cylinder #1). Where can I get a free illustrationed diagram (online) to be able to find and identify the location(s) and part (oxygen sensor) on this Escort, and please list the procedure for me to follow and the exact-size tool(s) I would need to purchase, in order to pull-a-used part (sensor).

Thanks, I hate thinking about car repairs and I have very, very limited with options. Infant repairwan