Something I heard from the writer of Atomic Habits is that you just have to know where you are, what the very next step is and where you want to end up. You don’t have to know every other step in between.
Point A is where you are
Point B is the very next step
Point Z is where you want to end up
Knowing point B is crucial to know the next step you should take to move towards your end goal. You just need to get one step closer to the end. Once you get to point B, then you can replan on the very next step to take to get to point Z.