Kev-Zippy

How do', its gotsa problem I have a 2002 synergie, 2.2 diesel, and the engine management light was coming on for a while, then it kept cutting out every 3 mins, then it stopped firing completely, took to a garage and they hooked it up to testbook, aparently my high pressure fuel pump is shot. Was just wondering, once i got one (aarrgghh) is it an easy job? Or is the front end coming off. Cheers for any help, kev