An attempt at giving some tips and information; hopefully more useful than the vague thing I said before, but more on material instead of 'technique', if you could call it that.
I just watched this video:
And understood almost all of it (there were a few words I had to pick up from the onscreen text). I showed a video of this series to my tutor and she said that it seemed like it might be around N2 level, mostly from the speed and the simple vocabulary and phrases used for the narration; the scientists and professionals they interview can be a little bit harder though, since they tend to use more specialized vocabulary; the young kids speak like young kids, some of the older kids mumble, and the young adults are probably the most clear (this series is aimed at young people, after all); you get all sorts of speech in here.
This level of understanding is up from just a few months ago (based on my perceived 'first watch' understanding of the earlier videos of this series), and definitely better than the start of the year, when I decided I needed to work on listening more.
As a vague metric (that's not terribly useful for this), I've only studied 10k words in Anki, but I might be able to claim up to 11k from things I've read, and maybe a few more that are relatively obvious (like 回復薬 and 傷薬, which are common in video games and don't really require a dictionary if you already know 回復, 傷, and both readings for 薬).
Personally, I found the visual cues of this series (onscreen text, graphs, images, etc) to be really helpful for latching on to the words I already knew, as well as helping me figure out ones I didn't (like 速筋 and 遅筋).
I've also been watching a lot of let's plays on the 兄者弟者 channel; the fact that it's different videos with very similar content (especially the videos of FPS games that Otojya plays) means that I don't get bored watching them like I would if it were the same video over and over. I'm sure it's not as efficient as repeating the same recording repeatedly until you get it, but it's certainly more fun. For a recommendation of a non-FPS gameplay video, I quite enjoyed watching Otojya's playthrough of 夜廻; I don't normally go for horror games, but this one wasn't really terrifying (well, not while watching); not to say it wasn't a bit unnerving, just not to the level of most horror games (my heart rate went up slightly while watching these videos, but the monsters being avoided quickly become less threatening through familiarity, even though they're all one-hit killers).
(links to the first video, in case anyone wants to watch it. I'd like to see this game get localized, since the Vita has so few (decent) titles... It wasn't bad gameplay-wise, just 'meh'. Unfortunately, that means it probably won't be going anywhere outside Japan...)
Now that I have a better answer for the original question: yes, keep at it (nearly) everyday with the native material, but make sure it's comprehensible; in your case, rather than from the words and grammar, comprehension will come from voice patterns and spoken phrases you've heard before. It's important that you find something you can stand to watch for an hour per day (or so; I just watch things as they come out). You don't have to love it (though that's preferable), but if it's a horrible chore, you won't get as much out of it. I'm fairly sure it will feel like a chore for everybody at first (for anyone else reading this comment), but after you start getting used to it, you can start to enjoy it more.
Having said all that, I'm still not that good at listening (that'd be an awfully quick transformation from a couple days ago, lol), but these things aren't intimidating anymore, and I understand them just fine. Compared to pure listening, I think watching these kinds of videos where there's usually only one person talking at a time helps a lot, since you get context and clean audio. Then, after getting used to that, videos with multiple people talking over each other are a little easier (better if it's still on the same kind of topic).
Edited: 2015-11-19, 11:41 pm