The next step
Trying to think through everything you have to do in a large project is paralyzing.
Practically speaking, it really only makes sense to be focusing on the next few steps.
Before you thinking about running a marathon, focus on your first mile. Before thinking about your first mile, focus on your first 100 yards. Before thinking about the first 100 yards, focus about your first few steps.
Your mind doesn’t need to be thinking about all of these things at once.
Focusing on the next tangible, achievable goal keeps things manageable, it keeps you sane, and it keeps you moving forward.