I was surprised - it was actually quite straightforward! I used the iClick tool and it worked like a dream. The trickiest bit was the reassembly, particularly connecting the home button cable, it was very fiddly.
The main comment I would make about the guide is that it combines instructions for removing the screen and the battery. I found that I didn’t need to disconnect the cables connecting the screen.
I would really recommend reading the comments - I learned a lot from their experiences.
A good guide. I’ve just replaced the battery on my 3 1/2 year old P9 and after reassembly the phone still works!
Would be useful to see recommended points to place the spudger to lever out the battery. I used the corners at the top (i.e. at the edge where the plate I couldn’t remove!) and slowly forced out the battery (which did bend quite a bit).
I actually couldn’t get this plate out: as mentioned by Steven there is a slight lip (shown on the photo - the tweezers are pointing to it) and this is under another plate above. That was just a minor complication, the real problem is that I couldn’t release the end of the plate nearest the edge, In the end I had to gently bend the plate up.
I found the screen/motherboard very difficult to move. I used the sucker (down near the USB/screw end) and the broad end of the spudger in the USB port (I was careful (I hope!) to not insert the spudger too far so I was just pressing against the case). It needed a lot of force and can away sunddenly but has left the fingerprint cable intact.
I have looked at other comments and I had removed the 2 screws next to the USB port and the sim tray, it was just plain sticky.