Pretending to be an expert in the area where you are not an expert does more harm than good to you and others. It is just a waste of time. If you are not skilled in an area, then you are not fit to work in that area. You need to choose where you can thrive.
It takes a lot of practice to be good at a domain. So do not fool yourself, pretending to be an expert. It’s okay to be a beginner, put in effort, and later be good at that area.