Hi
It’s fairly easy to do you just need to pop the glass off ,remove the display and remove the brackets that hold the hard drive in place
Heres video that shows sep by step
https://youtu.be/OXmHGrr4Vkk
I know the video is about a ssd upgrade but it’s the exact same process and just a little warning below the hard drive there is a power supply DO NOT TOUCH IT (sorry if that sounds aggressive)but really don’t as the is a chance you could get a shock of if it which I’m pretty sure can kill you ,however I have done the sort of repairs before and had no issues so as long as you are careful you will be absolutely fine
If you have any Questions please ask
Thanks:)