I'm quite relaxed about the procedure (as I write this anyway) and have had to go through all sorts of physical and psychological assessments to judge my suitability for what is still an experimental trial. Its on the NHS but at around £20k a pop just for the hardware they have to sure I can cope with the implant in body and mind.
They normally only use a local anaesthetic for this procedure, with a generous dose of sedation, as its best if the patient is conscious throughout. I'm fascinated in a ghoulish kind of way. Shall I take a book to read I wonder......?