hi all i am a new 4x4 saff owner and the past week a real grinding dry noise has been coming from engine , ive pin pointed the noise to the front of engine area as to the right of the alternator and up by the top cam pulleys , after reading a few post on here i think it coulld be the water pump bearings , is there anyway i can diagnose this for sure , and is the water pump a hard job to do (replace) ??

thanks