While the general consensus seems to be that you should go into this as blind as possible, I'll be the voice of dissent and say that you should do what works for you. If you, like me, tend to shy away from horror games, it might be worth watching a video essay first, and then playing the game afterwards, so that you feel "prepared." But if you feel like you can handle it, then you should definitely go for it blind. Either way, the video essays are definitely worth watching for their deep dives into the supplemental lore. Whatever way you decide to approach this wonderfully unique experience is fine. Just make sure you don't miss it.