Ok, you can still begin it. Get your paper and pen. Write one sentence only on as many of the stages you can.
I really think you are trying too hard on this one, pinksoil. Trying to cover this data for the prof is not a good thing imo. Don't go so deep into thoughts and memories, really.
Begin. Get paper and begin, and you will be ahead and the vexing of beginning will be behind you psychologically, ok? You don't have to do much at all.
(((((pink))))