A digital camera? Try it. You will find it absolutely useless through lack of detail, lack of terminal identity and lack of orientation. Is it,was it, upside-down? Especially useless if most of the wires are white, as at the end of the clip, when an entire new bunch of wires appear out of nowhere! A tester, however, why, that's just optional! A pencil and the back of an old envelope is sufficient, but, what if the outlet was wired incorrectly to start with?
And let's hope Mrs Doyourselfin doesn't switch the power back on to before he's done.
"Strip off the excess insulation with wire cutters". No, and don't use them to form the wire ends either.
I didn't see any groundwire insulation, BTW, did you?
Electricity travels at the speed of light. http://www.jimloy.com/physics/electric.htm
True, but about as pertinent as stating the exact length of the River Ganges.