For me the more difficult part right now is learning how to become self motivated. Going from having my supervisor coaching me in my PhD to being basically totally unsupervised and free to work on what I want in my postdoc has been very difficult both for my work and my mental health. You have to become almost totally self reliant. You start to value and amplify every bit of motivation you get. Discipline doesn’t cut it, because a lot of academic work is impossible to force. There aren’t many mechanical aspects of it, almost all of my work requires a tonne of diverse creative thinking, even just responding to reviewer comments
Back on stupidity, one of my favourites things has become to ask “stupid questions” as a postdoc. Partly because as a postdoc, people just assume you are very smart, so there is no pressure to “look good” or “not say stupid things”. There’s something weirdly liberating about hearing a bunch of very technical questions from PhD students and then me deciding to ask a very basic conceptual question. That said there are “stupid” questions and then there are ignorant ones, and the line is often blurry