When learning to repair a bike, you do not only learn to repair a bike. You learn other things as well, while and by doing the repairwork.
One of these things is the notion of trust. In order to repair a bike, you have to trust it. And, more importantly, you have to trust it in order to get on it and roll with it. It's a bumpy ride if you don't.
This trust is not just a trust in that it won't break down right away. That's part of it, but it goes further. It goes into knowing how it will break down, and knowing that you know how to repair it when it does.
A trust born in familiarity.
Because it will break down. Again and again. Not because of lack of repair skill, but because it's a mechanical object put into action, wearing and tearing all along. Entropy isn't kind on things in motion.
You can trust entropy. You can trust things to break down predictably (most times). You can trust yourself with knowing what to do when that happens.
Learning by doing. It's a thing.