Excellent instructions. The process is straightforward - the only tricky bit is reinstalling the screen accurately. There seems to be some conflicting views on the internet about the best way to do it and which adhesive strips to use - the 2012-2015 strips now seem to be supplied for later models, and they worked fine on my 2017 iMac.

My advice is just to take take it all very steadily and always read one stage ahead before you start on your next stage just to know where you are going next. I installed a 2TB Crucial SSD and the results are very good.

Done all fairly painlessly. Took less than 30minutes.

- Yes, iSclack is definitely worth it. Separates the case in one quick, simple move.

- As others have said, you can skip steps 17 to 22. I did, and it made things simpler (you just have to be careful to keep hold of the top half of the iPhone and make sure you don’t strain the cable)

- Removing battery adhesive the only tricky bit. I warmed up the phone but the adhesive strips broke. However I managed to pry the battery old and then removed the old adhesive.

TAKE IT SLOW AND EASY and it should all go fine.