G
Guitarist
I think if you read his post carefully you'll realise that he didn't come on here asking how to do it. He asked some very pertinent questions based clearly from an underlying knowledge and experience and was simply seeking some clarification. And you'll also see that my advice was to get an approved electrician in. There is nothing wrong, in principle, with DIY Dave so long as Dave knows his own limitations and when to seek advice - and that's exactly what the OP did here.
I have to say that I completely disagree with that. I've lost count of the number of times that I have attended a job, only to find that while DIY Dave has done a fantastic job installing/connecting whatever he has just bought from his local DIY superstore, due to not having any test gear he has completely missed the fact that he's connected to a dangerous circuit.