I used an iron scraper/palette or putty knife (you name it!) and inserted it in the gap from the end side ( logo!) to cautiously lever the aluminium cover off the plastic body. A plastic spudger seemed to weak for me to do this work.
How did you release the inner body out of its 4 hinges? GOT IT! First broke a plastic spudger on trying but then (under light control) used a small screw driver to lever the bolts on one side out of their hinges. This step is missing between steps 6 and 7.
Yes - at the APPLE Store for $69 XD
I found out that the black plastic bar is a lever, which swings up outwards left side — away from the backside of the casing — and then drops off of the right side, which releases the rubberized bolts, that hold the hard drive! The hard drive then could be lifted easily out of its hinges. Mind the cables!