What use is it for diy? Releasing oil is more for cars ime. I've never got wd40 to release any diy thing, it makes a total mess out of wood, and there are far quicker ways to release fixings than that, like drilling or grinding.
Some are too stiff for anything to work though.
numbers
No chance! A real diyer knows feckups happen and is equipped to deal with them all if they do. Its just part of the job. And why do onlookers get so overexcited about it?
There are good ones, but far too many skill-free folk to trust unknown people. Gawd you should see some of the plastering. Whoever did that should have described themselves as artexers to avoid Trades Descriptions Act problems.
I guess that list was more for those that treat it as a weekend hobby. I wouldnt be buying supplies at BnQ or putting things up askew meself.
or a house maybe. There cant be many people left for whom the 2 are the same thing nowadays, used to be.
too many legal problems these days, with power tools anyway, and ladders.
Not nearly so likely to admire a professional's work.
I'm wondering what way the OP was thinking there.
I think that concept features in some people's diy efforts as well. Some folk are quite brazen about it too.
NT