Before upgrading your hard drive you must first back up all of you game data.
To do this, you must go to settings on your ps4 system and upload the game data from your system to the clod using playstation plus. An alternative could be using a flash drive and uploading all of the game data there.
Now you have to download the software update on Sony's website. Note: Your ps4 will not work with the new hard drove if this ps4 update is not installed. After saving the update on a usb drive you can set it aside for now.
During the next step you won't need your ps4 at all.
In this step you have to open the ps4. To do this you must press down and push out on the cover with a bit of force until it comes out. This process should be relatively easy.After this the hard drive will be revealed, the covered square shape located to the right.
Next we're going to get a little physical, but not in the way you may think.