STEP 1: COMPLETE THE MAIN STORY, MAKING ONLY LIGHT CHOICES + DAILY TASKS –
Start the game on any difficulty, put it on Story Difficulty (Easiest Difficulty available) if you want less frustrations throughout. The game can be a bit challenging on Normal Difficulty at times. The most important part about your initial playthrough, is picking an alignment (Light or Dark) and sticking with it throughout the game. See A Shining Light for more.