This is a very comforting fiction to tell yourself when you’re faced with new and unfamiliar challenges. However, it’s not really true. Plenty of people within an industry or field know enough of what they’re doing because they’ve gone through it before and/or done all of the heavy research to prepare for these situations. I see the “nobody knows what they’re doing” fiction brought out as an easy antidote for imposto…
I'm pretty junior in terms of YOE, but I hate when I see people say things like "don't worry, I have no idea what I'm doing and I have x YOE. You're fine!" to people on the internet. I have a decent understanding of what I'm doing, but I worked for it by doing exactly what you described in your last paragraph and then synthesizing that knowledge into an explicit process. If you don't know what you're doing you're eit…
Those situations make it seem like you’re just shooting from the hip/groping in the dark all day … but that belief is wrong.
Either way, the right response to the feeling of impostor syndrome should not be to shrug and say “oh everyone’s like that” (which is how you get the Elizabeth Holmeses of the world); it should be to look for objective heuristics to identify whether you are, in the large, performing competently.
Edit: earlier comment on this issue: https://news.ycombinator.com/item?id=19214749