Before considering this job you need to read this thread from another member who's done it. It's not impossible (quite a few members have done it) but it's also not as straight forward as you think.
http://www.volvoforums.org.uk/showth...t=v50+facelift
SonyVaio can also help as he's done it to his V50 (just do a search for him or he may also reply as he's a very helpful chap!).