Excellent guide, many thanks to the author and commenters. I replaced the rear facing camera at the same time and had no issues with parts or tools.
Agree with the comment from Nathan for Step 17 to be careful not to displace the captive spring, it would have slipped away from me if I had not read the comment. Tricky to manouvere that part.
Get the magnetic mat, makes things a lot easier. Thanks again.
Straightforward guide, completed in about 20 mins. The new battery reports 6746 mAh. Many thanks.