I think my starter motor is dying as it makes wierd noises and takes a while to start sometimes. Which one do I need for my 2.0 zetec DOHC? Also are they fairly easy to replace??

Check the earth strap to the engine, I have just had the same thing and bought a new starter which did the same .
now the suplyer wont take it back as it has been fitted.GRRRR
Fitted a new earth strap after advise from a mate and bingo ,off it went.
Denis.

Ok cheers for that. I'll go have a look. What should I be looking out for?

Just found the earth strap and it was snapped!! Ur a life saver. Was just about to order a new starter motor.