Fantastic article. Do what the instructions say, and you will conquer!
Actually, there are only 11 metal clips. From the face side:
On the top, only 1 clip centred 35mm from LHS. Avoid the first 30mm on the LHS, and the last 20mm on the RHS
On the RHS there are 4 tabs centred at 20mm, 40mm, 65mm and 85mm from the top. Take great care to avoid the topmost 15mm
On the LHS there are 4 tabs centred at 20mm, 40mm, 65mm and 85mm from the top
On the bottom, there are 2 tabs, each one 10mm in from the edge.
Also, I bought 2 spudger bars with the battery, and found them invaluable. The plastic ones supplied are nearly useless
I released the battery first (with the spudger), which enable the whole case to be butterflied. Then, using a splinter probe with a slight hook lifted the retaining clip, and removed the existing battery lead. Then using a very fine tweezers inserted the new battery cable, and pushed the retaining clip back into place, while holding the cable with the tweezers. All good.