I've mostly plumbed, entirely wired and partially built my own house. I can see better ways to do what I did, of course, and much much worse ways to do what I did. The boiler installer I hired was, thankfully, top notch (I am ridiculously careful with gas).
Oh and I also installed the fibre, installed an ethernet and wifi router, protected it all with a firewall and integrated a server and VPN.
And I grow about ⅔ of my food.
I do all of this without being qualified to do any more than make a coffee and people who are actually 'qualified' (or, more realistically, licensed) have mostly congratulated me on my work.
Should I have done none of these thing because Whitehall thinks erroneously that I'm too stupid? Fuck those cunts. My daughter is safe, has good friends, is well fed and well educated despite their bureaucracy, not because of it.
If anyone thinks I should not have done the plumbing or the electrification, despite being unlicensed, explain why growing my own food and configuring my own internet are OK. Or try and convince my that I should sacrifice my router to my government. And if you attempt (and you will fail utterly) to do that, prepare to be told to fuck right off.