On mounting the case, nothing complicated.
Is unscrewed, is opened, it locks the hard drive to its connector, is closed, is screwed.
In short, it does not take long and it is as simple as "Hello".
The case comes with a suitable screwdriver (well, just enough to put his small screws, nothing to expand its toolbox)
a spare screws, a protective cover (which is quite useful) and a connecting cord Y (USB obviously).
Note that the box allows a USB3 connection, also compatible USB2 (but of course with rates below the USB3).