I would say that it does mean precisely that - what is your point? However Electriying may view me, I fulfill my (and your) definition of a DIYer. My point, of course, was that generalisations which tar all 'DIYers' with the same brush are not necessarily always going to be fair.I thought the term diyer meant a person who practices 'Do It Yourself'. This is as opposed to a qualified and practising professional.
Kind Regards, John.
Some diyers will have deeper knowledge than others, as will some pros.
My point is that there is a different onus on a professional (when in one of the schemes) for part p.