Learning to write proofs is really learning a new kind of thinking, and that is not easy to do alone. For sure you can learn from books or other resources alone, but as with everything, when you are stuck in some way, good guidance can be very beneficial. I’ve thought proofs and logic at multiple levels and even though people struggle with similar issues, there is almost never a one-size-fits-all way to help an individual progress. It all depends on your context, way of learning, temperament etc etc.