The Important Thing Is To Pretend
This is profoundly useful advice which cuts to the essence of how we learn. By pretending. By ignoring the fact that we dont know how to do something and choosing to behave as though we did. Children learn in this way. Adults have mostly forgotten how. We convince ourselves that its too difficult, that our minds dont work that way, that we lack the physical aptitude, that we need to take a course when actually all thats required is the mindset that says: I know I dont know how to do this, but if I carefully observe someone who does know, and then imitate them, Ill be able to fool myself into doing it too.
If theres no-one to model, you might need to imagine how an expert might do it, or read a book to get started. The important thing is to pretend.