Cathy, I dealt with some of the questions in my earlier post. The process of putting the device in is nothing to worry about much, they do it under local anaesthetic/sedative and it doesn't take that long. You will have a scar a couple of inches long over your collarbone. That takes a week or two to heal up. Physically I find it a nuisance but my biggest issue is sleeping and it depends what position you usually sleep in - I used to sleep on my front and the device does tend to stick out slightly so I can't get comfortable and have to find another position to lie in. But some people seem to adjust ok.
The big question to deal with is who is in control of your body, you or your consultant and his technician? Be prepared to be quite insistent it is configured as you wish and that if, say, it needs tweaking they must do it. I actually put this in writing in advance so it formed part of the consent to having it put in. Then I complained when they adjusted it without telling me!!