When you change a job or get promoted, sometimes it feels like in the books or movies, when the protagonists wake up and has no idea where he is or what is happening.
What they usually do is they start exploring and putting together a big picture by doing the small things to survive.
The same strategy works in real life. If you find yourself in a new situation. It is a simple OODA loop (observe, orient, decide, act). It will unstuck you from any situation, if you start small enough.