being too soft or too rough on the clutch is a matter of millimeters is ridiculous

On this point specifically, don't think of it as millimetres of distance. You act based on how the car responds, not trying to hit a specific distance of pedal movement. You already do the same thing with your other foot - you don't think "I need to press the accelerator down 55 mm", you just press it a bit more or a bit less until the car is going the speed you want it to go at. Same deal with the clutch, there just isn't a dial on the dashboard that tells you where you currently have it.

You're right that driving involves processing a lot of information at once that nobody is particularly familiar with absorbing when they start. It is difficult and dangerous. That's why there are tests and licences. But in much the same way that typing was once completely alien to you and is now something you do with little active thought, you'll get there soon enough with the clutch too. And if you learn it now, you'll never be caught out in a situation when there isn't an automatic option available