Uppgrade to SSD
Well, opening it was pretty straight forward as soon the mighty adhesive strips was conquered. Closing it required attention and carefulness because of the stickiness of the new adhesive strips. But nothing was really difficult.
Dont walk away in the midst of the repair and do something else. You COULD forget to reconnect the cables and close the computer so you have to open it again. Not that I did, but theoretically speaking.....