The original 1 TB Seagate drive failed so I upgraded to a 2TB and added 128 GB SSD.
Very easy with the proper tools. It was difficult to know how the LED driver board cable disconnected from the LCD... just pull the ribbon cable straight out!
The computer is incredibly responsive and fast with the SSD! I highly recommend this option. As you can tell from my photo, I am a bit of a nerd :) .
Heavy-Duty Suction Cups (Pair)
TR8 Torx Security Screwdriver
TR10 Torx Security Screwdriver