Earlier Reimeiki games and everything pre-Reimeiki can be easily text-hooked with Textractor. (if it's a Studio ego! era game that you got through DMM, you'll need to hook a .bin file rather than the game's exe file, it's a little weird). You'll probably want to use Google Translate camera mode on your phone to translate menus and item names, though.
But starting around Reimeiki #15 (the Keika/Hatsuka/Natsu set) there was some engine change that Textractor never updated for, and trying to hook the games made at that point and later becomes an absolute pain in the ass.
It can be done but it literally took me an hour to hook a single game, since you have to do the "search for hooks" option and then painstakingly go through an enormous number of outputs to find one that's actually outputting complete sentences. And then I needed to reinstall stuff because my hard drive died and my previously found hooks stopped working. And then that game got an English release, so I sure as shit wasn't going through that again.