Here's a bit of free advice - if using an electric drill to screw shelf brackets to the wall, don't leave your hand between the bracket and the wall when applying power to the drill.
And to rub salt into the wound, so to speak (not literally, that would just be silly), the postman tried to deliver a package from Hattons this morning, while we were waiting for the MIU to tell me that I hadn't broken anything. That was a relief, though.