Hi, Unless you've got arms like a stick insect forget it, changing from above becuase you need to take so much off (if its a 4.4i anyway ) remove undertray then draw a picture of pulleys and direction YOU WOULD'NT BELIEVE THE DIFFERENT WAYS IT CAN NEARLY FIT !!!
if you are still struggling then remove the fiscus fan blade aswell as the housing but you should be able to do it all from underneath apart from making shure belt is neat and tiddy from above....
GOODLUCK (change the other belt while your there!)