Used to work for a company that installed, serviced and repaired expensive Danish Hi-Fi and Tv's. With the increasing use of remote functions on the equipment it became a nightmare trying to instruct a customer (Invariably the female half of the partnership due to the time of the day for installation) in the amount of time available, how to drive it.
One of the punch lines I always imparted before leaving was " Read the manual cos we'll be ringing in a couple of days and asking questions on it" After a suitable silence period, the ice was broken by a chuckle. This was then followed by the MOST important instruction, "IF you get tied up with all the command settings and it goes mammaries up, switch off and unplug the mains, count to ten, replug and start again, the equipment will have reset to manufacturers original settings. This would be the first thing I would do if called out on a service call and that would cost you £70"
Surprising how many could achieve remote programming via a quick telephone call.
You might not like what I say,but that doesn't mean I'm wrong.