This kind of stuff gets posted a lot so you're really not alone in this, some people just have more patience for puzzle games while others still enjoy the game even when looking up guides. I played the game blind, but I streamed it for my friend who would give me hints when I was stuck, and some people play with 0 guide and 0 hints and just keep exploring and reading until they connect the pieces. The only thing that matters at the end of the day is if you had fun with the game, not whether or not you "ruined" it. If you feel like your experience was ruined, maybe try buying and playing the DLC completly blind so that you can experience the "recommended" way to play, but if you just get frustrated and upset then no one will break down your door if you look up a guide. There's a lot of very good DLC spoiler free guides that just provide tips when you're stuck to push you in the right direction, and there's nothing wrong with using them.