You can just jump in without playing the first two, for sure. But this is not like Skyrim or Diablo, as it uses a turned based action economy. When you attack or are attacked, the entire game stops, initiative is rolled, and every one in the fight takes their turn to perform their actions (and bonus actions). Everything. just. stops.
So this is not a hack and slash like Diablo or Skyrim, but it is an amazing game. I prefer games that support Real Time With Pause, where the battle can just carry out in real time unless you decide to stop time and micromanage your party, but in this game, every single step is micromanaged. The hype is well earned, and real. But if it’s not for you, it’s really, not for you. Hope you give it a try.