I dont think there is a guide as of yet. but i will be atempting this soon as mine now has a gap behind it where a piece has broken off and i dont face £30+ for a new one!
i shall post the results soon
These are the pieces you need to remove and the part is less than £20 from a Fiat dealer. When you have the handbrake cowling off, turn it over and there are three spring clips to remove then the sliding cover comes off.