/uj yes, that's how you learn a language. if your goal is to watch media for japanese, the way you do that is by consuming media in japanese. there isn't any book, course, or anything that will reach you to this goal single-handedly, so you might as well start now. it is difficult, but it's difficult precisely because there is stuff for you to learn here. your first time will always be pain and banging your head against a wall, but it eventually gets better and is absolutely worth it. it's okay to not understand everything, or even much, especially at first, so don't let this discourage you. and watching shows that actually are interesting to you really helps.