Well there is no real secret to learning stuff. Other than a few very extraordinary disciplines, anything can be learned if you put in the time and keep at it regularly. Of course, this statement is only valid if you apply the proper learning techniques, but also these can be learned.

It is hard to give you general advice since everybody is at a different mindset and has different learning techniques. What helped me was realizing that whenever I hit a wall, I would stop trying because it felt annoying, difficult, or I didn't really know what to do.

The secret for me was to do everything I can, meticulously and methodically, to break through the perceived barrier in my understanding of something in very small steps. And keep going until I felt the curtain was lifting.

Now, it is just a matter of how long it will take.