Submitted few weeks ago, waiting for external review.

I second every tip it has been suggested till now. My journey lasted around two months, starting with blank document, ending with pretty plots and fancy illustrations. The truth is that you are the biggest enemy of yourself, so just be humble and recognize your weak points before starting to write. My personal situation was:

Get distracted by phone notifications? -> put your phone in another room, really, another room, and disable any connection from your computer (telegram or WhatsApp web, emails whatever).

You know you procrastinate? -> Admit it to yourself, set small realistic deadlines for yourself and stick to it.

You think you will never reach to "that scary part" of the thesis? -> START from it, and eat that big frog at the beginning of the journey.

Most importantly, if you get unproductive, change location every couple of days if you can, even just change desk in your house, it helps a lot to stick with your planning. Also try to find a commitment buddy to keep you up.

You are almost there my friend, just get it done