Have you ever been faced with an overwhelmingly big task? So big that you had no idea how to get it done? I have dealt with this many times and have found that the only way to tackle it is to break it up.
Prioritizing and creating more manageable sized tasks is crucial to your sanity and success with these large projects. Allowing yourself to get chunks done at a time makes the project seem much smaller and less complicated. You can then create your timeline to get it all done and complete the task one step at a time.
Breaking up your work is not admitting that you cannot complete the task in one fell swoop, it is merely working smarter, not harder. So, save yourself the stress and anxiety, break it up.