It’s the same as learning anything, really. A big part of learning to draw is making thousands of bad drawings. A big part of learning DIY skills is not being afraid to cut a hole in the wall. Plan to screw up. Take your time, be patient with yourself, and read ahead so none of the potential screw-ups hurt you. Don’t be afraid to look foolish, reality is absurd, it’s fine.
We give children largess to fail because they have everything to learn. Then, as adults, we don’t give ourselves permission to fail. But why should we be any better than children at new things? Many adults have forgotten how fraught the process of learning new skills is and when they fail they get scared and frustrated and quit. That’s just how learning feels. Kids cry a lot. Puttering around on a spare computer is an extremely safe way to become reacquainted with that feeling and that will serve you well even if you decide you don’t like Linux and never touch it again. Worst case you fucked up an old laptop that was collecting dust. That is way better than cutting a hole in the wall and hitting a pipe.
I keep thinking I should get a hardware key but then the cost, potential incompatibility, and my own confusion over all the options always stops me. But I have also had phones just randomly not turn on one day, so the current solution is a file folder full of OTPs. Sucks.