Overall tip -- This DLC requires a moderately different approach than the vanilla game; do not expect to be able to play it as a shooter!
Please, no spoilers.
Tip # 1 -- Take time to READ. There is information essential to your survival that many XBox players missed because they were in a hurry to get running and shooting. These players died frequently and often.
I cannot stress this enough. When in dialogue with NPCs be sure to pay attention.
Next.
Edit -- *sigh* Yes, I know I spelled spoilers wrong.
