DLC question (sorry if this has been asked a lot)

I searched the subreddit but didn't see this asked, maybe I missed it. I'm about halfway through my first playthrough, or right there at it, and I'm wondering if I should buy the dlc now? I don't want to miss anything or have it mess up anything I have going now. This game can be confusing so thought I better ask about it before I got too far. I definitely want to buy the dlc though. Thanks in advance.