Opening your mind (treating knowledge as a set of hypothesis) is not all that difficult.
It consists of admitting to yourself that what you “know” might be wrong, or at the very least, it’s probably only part of the truth. Once this is done consciously, knowledge is subjected to scrutiny as it comes up. You develop a habit of questioning what you know as you re-encounter it in daily life and in the process of rethinking.
I found that it felt familiar, similar to how I was as a child. Back then, I didn’t have to know the right answer.
Years of school and work have taught us that having the right answers is important, but now we know better. Knowing how to ask the questions and be naive is much more valuable.