To be fair again, I had an 18 year old who had just finished three years doing the proper course who came and worked with me. A quiet lad and thoughtful, but he did not have a clue when it came to first fix even. He put one earth on a rfc 2.5 cable into the terminal on the metal box and the other earth into the socket earth terminal. I asked him to wire a ceiling rose and it was a complete mess. I asked him to terminate some lighting cables into wagos, he could not do it at least at first. After showing him a few times he got it. Whereas I could terminate the lot per light in a couple of minutes it was taking him 20-30 minutes. It is very much to do with experience in the end and being guided by someone who knows the skills. For instance the man abducted by the aliens, it is ok to know how to test an rfc but what about when the figures go wrong, how do you interpret/understand it and remedy it? Again experience and a good grasp of the maths/science are the key factors which I think no course can teach even if they are policed as it were.