One pattern to try might be, faced with an impossible writing task, factor it:

A) write one-page high-level bulleted list type outline of what would need to be in Thing (don't be put off by having no idea how to do some of the bullets);

B) for each bullet, write one to two page sub-Thing.

Many students can do B but need A done for them - but I bet you can do A, provided you can limit yourself to a page and just do that.