How easy is it to change the keypad on the k800i (and how do you do it)?

The keypad on mine has become battered and scratched.

I've seen that they're available
(http://www.datakits.co.uk/store/genu...ad-p-3570.html,
for example),
but do they come with fitting instructions? Does the front fascia of the
phone unclip, or something?

TIA