Hi
As far as I can see there isn’t a guide sadly;(
But YouTube has lots (if there aren’t any for your device specifically it’s quite easily to follow along with another one as it’s a similar process across a lot of them)
All you really have to do is get a thin plastic pry tool and pry up around the edge of the keyboard backlight(the thing black paper like film) and then remove and then put your new one in
It’s quite easy but if you need any help with it just ask
Hopefully this helps
Thanks:-)