Katarsys is a little difficult to work with because he is extremely stubborn. That said, he's good at what he does. Unfortunately, not everyone has the patience to work with someone like him and that includes both the HF dev and apparently the Better Repack dev, STN as we call him here. The HF has been an issue in regards to Kplug for a long time now, anyway, so I wouldn't bother with it.
As long as the scene in question isn't her first time, yes. That said, I don't remember names, but there are a couple mods that disable that little requirement and any scene after her first can be exited from the very first moment you take control.
As for where to start, there is a search function in the top right of the page on this site. Yes, the English is almost native level in the Steam translation, but getting it by using the actual Steam version, called Party, comes at the cost of not having any of the school elements or DLC. That said, Better Repack, the version on here, comes with a version of it that is adapted to work with the Japanese version of the game that acts as the base for Better Repack itself and therefore comes with the DLC and school elements as well. Do note, however, that no DLC element is translated by the Steam translation because the DLC isn't meant for western players. No, there is no better translation than the one in this version because it is the official one that the game devs had done by fluent English speakers and the only other human translation project is slow moving and/or dead at this point, having been on two or three personalities and a few story scenes for the last several years with no sign of activity. The DLC elements are indeed translated by a machine in real time over the internet. As far as optional folders, there are multiple and they all contain things that are up to you, the player, to decide whether to install them. Optional mods contains several mods that enhance the game experience, but may have some conflicts, I'm not entirely sure of the criteria STN uses to determine whether to preinstall a mod or place it in the optional mods folder. There is also an optional folder outside the main game folder that contains stuff for the studio, you don't need this unless you want them for creating animations and screenshots like you see in most of the VNs on this site. It was separated to provide the user with a smaller package to download. As for addons or tips, get Kplug, it can be a bit hard to learn just because of how much it has, but it is well worth the effort because it adds A LOT to the experience. I strongly advise you to read the manual THOROUGHLY before using Kplug. Also, be warned that the first person mode is on by default, so you will want to turn it off in the Kplug options at first until you get familar with the Kplug first person controls.
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