When I write, I rapidly splurge out the initial scene, or idea that's taken me, then slow down and write a chapter per paragraph for the remaining chapters. Be it a description of what's coming in that chapter, or even the opening of that chapter itself.
The only thing that gets me through though, is feedback from others as I write. I simply cannot conceive of the idea of writing 80,000 words, without someone telling me it's "ok" along the way. I get eaten by self doubt...what if I get to 75,000 words, but the story turned to rat droppings at 5K?
As such, my poor friends have read 10% of one project, 30% of another and 25% of yet another... They're very patient!