No, it isn't very difficult to replace. Just in case you aren't sure, it is found here.
The replacement procedure is straight from the Haynes manual. They say it better than I can.
Replacement
Disconnect the negative terminal from the battery.
Remove the filtered air tube from the throttle body and air filter housing.
On SOHC engines, remove the air inlet tube. Disconnect the electrical connector from the engine coolant sensor and camshaft position sensor.
Remove the brake booster hose and electrical connectors from the holders on the end of the valve cover,
Remove the bolt from the camshaft sensor and lift the sensor from the rear of the cylinder head.
If necessary, remove the target magnet mounting screw and remove the magnet.
Installation is the reverse of removal. If removed, align the locating pins on the backside of the target magnet with the locating holes in the rear of the camshaft and tighten the screw securely.