It's a fairly straightforward swap; the videos are on YouTube - I did it earlier in the year. You just need a bit of nerve and some eye protection as you drill/snap the old one out.
The main thing to be aware of is, avoid buying a cheap and nasty part - anything less than £40 on Ebay, even if it claims to be the right one, won't be. Cough up a bit more for the right one and you'll still come out ahead if you change it yourself.