See, I'm more of a pantser than anything else. I've said before that I've had this story in my head since high school. I'm not joking. I had originally planned to make the main Earth characters high schoolers, but then I realized when I went to write it last year that it wouldn't give them the access to the same level of classes I want them to be taking, nor the same level of freedom and autonomy they need to have, so I changed it. Aside from that, this story has been rumbling around for over a decade. I don't need to plot out specific points because I already know what the characters need to accomplish.
I find that if I have the basic outline in my head, I can pull details as I go and just write. It's very similar to freewriting, and I push myself to advance at least one of the storylines each day. If I spend an entire day doing research (who knew that characters studying music in Wichita, Kansas would require an indepth knowledge of the layout of the city of Salina, traveling distance from Hays, KS to Colorado, how to soundproof a basement, various types of birds and wingspans and how wingspan and profile relates to speed and dexerity in flight, and comparative knowledge of college programs throughout the country?) then I'll make sure to advance two plot points the next day.
Another trick I learned last year, take the weekends (or whenever you have a day off work) early on and write yourself a massive pad. I had one day I wrote nearly 10,000 words. That gave me a few more days when work picked up or when my wrists were in too much pain to sit at a keyboard where I didn't have to feel bad about not writing. So write yourself as much of a pad as you can. Then ignore it. Still focus on your 1,667 a day. More, if you can.
Don't edit anything. Don't cut anything out. I went back yesterday and read what I wrote last year. Took out about 200 words, and there's much more cutting and rearranging I could easily do. I didn't do that last year because November isn't for editing, it's for getting words down. Editing can come much later. Unless it's for a typo or a completely wrong word in the sentence as you're writing it, ignore your backspace key.
And you can see by the lenth of my posts here, I'm already getting ready. Sorry for the pre-novels. I can't help it.