I normally just get my laptop, start reading the first chapter in my university and see who picks an interest for it from my group of friends (got more or less 8 people to read it by doing that).
With Umineko is easier, as I have such a large group testimony of its quality around me, so we just go talking a lot of amazing stuff about it and picking the interest of more people. Helps a lot I’m in Letters and Philosophy, since people really take interest on clever tales like Ryukishi’s very fast, especially when so many other students talk high about them.
I personally transferred Umineko from my pendrives to at least 30 people in my university, though I’m not sure just how many actually got to the end of it, as it’s infamous in there as well for being so freaking long.
This is also the advantage I had introducing Higanbana for those interested in Umineko that wouldn’t read it for it being so gigantic. I say “it’s a collection of interconnected horror short stories with a profound dark theme in common within them with some supernatural elements, from the very same author”, and voilà!
As long as the people around are interested in a great read and open-minded enough to go through a virtual book of a sort, it’s actually rather easy for me to spread most of 07th Expansion works (and I say most because both Higurashi and TRT kinda have too many “otaku elements” on them for the tastes of a LOT of people).
That said, I also could successfully present Umineko for 2-3 teachers of mine while picking their interest (Higanbana is on its way). And yes, for that I skipped those silly/creepy/unnecessary lines from the beginning of EP1, as they were proven for me to be insta-interest killer in many circumstances (the “okay, this is garbage, we are done here” kind).
I couldn’t do the same for Higurashi as there are entire segments of that stuff in there (while Umineko only had that minor one envolving Battler wanting to touch Shannon’s boobs paired with some very specific lines of dialogue I could easily strategically skip).
By nature, Higanbana is just so absolutely dark I can’t remember seeing any scene of that nature in there, so I highly doubt it will be too difficult to present even to teachers, besides the very screwed up story as a whole.
But yeah, that’s just my own perspective around this stuff (I’m a living advertiser for 07th Expansion in any place I go lol).