Some obstacles that stand in the way of understanding
As I often say, if the process of learning a language took the shape of a high-rise building, understanding movies/series with ease would be at the very top floor. Admittedly, it takes time to accomplish.
Having said that, if you are prepared to put up with a certain amount of confusion and lack of understanding and spice up your watching experience with a bit of imagination, nothing can stop you from starting now, regardless of the level you are at. Bear in mind that, the lower the level, the fewer demands you should make on yourself.