2000 honda civic ex, Right rear wheel speed sensor?

Where is this located, and is it easy to replace?

Speed sensor? Those are in the transmission.

The right rear Wheel Speed Sensor (WSS) is exactly what you've said, the location is at the R/R wheel. Is the ABS light on? What's the code? It'll take average people less than 30 minutes to diagnose and replace the WSS:

The video will show you how: It's on 2002 model but yours is the same way: