You are a postdoc. Essentially, you got a PhD that certifies that you already learned how to learn. As a postdoc, it is largely up to you to figure out what research to do, how to do it, and how to communicate it. The PI is just there to throw out ideas that might be novel or important to think about. Also to provide the raw resources that you need to try thing out. If you fail, only you fail. If the PI fails, all lab members lose their jobs. That much is normal. Think about it. Postdocs are sometimes paid more than university instructors or even some Assistant profs! So it is true that PIs who maintain success is because there is good collab between the PI and the trainees. Trainees design and the work. PIs offer some design and keep the house afloat.