Amazing advice. This technique is what got my PhD thesis across the line.
Word vomit and just concatenating together all my current work into a single LaTeX project. Once it existed as a single document and I could start to “see” it as a thesis, even though most of the writing was terrible, the momentum was there.
Currently writing my MS thesis. "Concat all my existing work into a doc" was my initial move as well, and I discovered I had written a little on almost every topic already. In some cases, had written lots.
That let me move to outlining and shuffling things around almost immediately, making writing about filling gaps instead of staring at a page. That in turn let me evolve my writing along with the codebase; now, in late January, I'm well ahead of schedule on written material (knocks on wood)
Word vomit and just concatenating together all my current work into a single LaTeX project. Once it existed as a single document and I could start to “see” it as a thesis, even though most of the writing was terrible, the momentum was there.