I'm writing this particularly as a way of accountability; I have an assignment due in a few weeks, and I feel absolutely paralyzed. Particularly in terms of where to start — despite having already taken some notes.
I now need to take these notes, and develop them into a proper plan, and then get to writing it up. However, I will ask: have you been in a similar situation, where you know kind of where you're going to go, you just need to actually do it? I guess that — like my writing writing this post — it is a lot of finding an activity that allows you to switch from that paralysis, to actually getting on with it.
After all, it is no good being petrified to start, out of a feeling of perfectionism, and have nothing to hand in.