I have (are you ready for this...) fitted a brake block to a small person's bike. No, I didn't forget that these things come in pairs... someone else did the first one, to show me how, then I did the second one (with only one 'grahh! Butterfingers! Where'd that ****** washer go?' moment). Then I asked them to check if I'd done it right, and they said 'bloody hell, did I do that one? [yes, they had] Well, I did a crap job!'
So they told me to redo the one that they'd done and explained what it should end up like and I did and they came back and said it was spot on. Said small person now has an extremely effective from brake. I is proud
(And yes, I realise that this is "Fettling 101 for utter numpties' but it's my first EVER brake fettled!)