No offense intended, but as you point out you are unqualified, doesn't make a bad person or indeed bad decorator, indeed for all I know you could be absolutely top drawer. You are however you look at it unqualified, it's the same as saying (in terms of qualifications) "I've been doing domestic electrics for 30 years, but I'm not qualified" That's an example BTW I don't do domestic electrical work. FWIW I work in IT, and yep you guessed it... I am unqualified.
... and that anyone thinks that really matters is a shoite state of affairs, imho.
Part of my role is to maintain our firm's certifications, and what a load of crap that is.
Online submission of (effectively) bits of paper, that presumably some office admin. reads through. No real world checks. But, as certification is a pre - requisite of many tenders, a necessary (if pointless) evil. It's a money - making game, that you have to play. No assurance of quality, safety, or anything much else.