94 chevy S10 blower motor resistor

Can anyone tell me where to locate the blower motor resistor on my 94 chevy S10, and how to change it? Is it a job for an amature?!

Thanks

http://www.autozone.com/R,APP1252229/vehicleId,1940502/initialAction,partProductDetail/store,505/partType,01160/shopping/partProductDetail.htm Click on this address to see what it looks like.

The resistor block is located very near the blower motor. This is so the air from the blower helps to cool the resistor block. If the blower motor is on the firewall under the hood, the resistor block will mounted next to it. If the blower motor is under the dash, it will be mounted on the plenum next to the blower motor. Sometimes the glovebox requires removal to gain access to the resistor block.

Tester