Thanks. A well-organised guide, very good pictures, and every step explained.
BUT
For a guide headed "Circle Pad Replacement" it completely fails to show how to actually replace the circle pad! (Which is why *we are all here*!)
Luckily I flicked across to another guide that gave me the clues I actually needed. (quiet "yay!")
Two more points:
1) There is no instruction advising us to remove the SD card. Would have helped (a lot).
2) With all the covers off, and while turning it over to insert the circle-pad, it is possible for some parts to simply drop out. The little corner thingies for attaching a carry/safety strap. Not essential to its function, sure. But still. That info could have helped me. (I found it on the carpet five minutes after I thought I had finished.)