Sometimes it's real hard to muster up the energy to try to get over road blocks. It's one of those things where you work hard to get something right, you wait a day, you realize you failed, you start over, you fail again, you sit on it for another couple days mulling it over, you try again, and then by the time you finally get it right you realize that you just spent a week and you only managed to eke out two pages, and that you still have 300 to go. Makes you feel like you'll never finish.
But luckily those roadblocks don't occur very often, so it's not as bad as all that. And you feel even worse if you don't try to keep going, so when I said back in one of the essays I uploaded here that writing can feel like exercise, this is exactly the kind of thing I mean. I assume I'm not the only one... otherwise there wouldn't be this stereotype of writers and booze.
(Incidentally, I try not to drink while writing because I like to keep strict focus these days. I tend more toward coffee.)
Anyway, I'm slowly approaching the last section of Part One, which is roughly a third of the book. A lot of the issue right now is trying to fix old logic problems. Like, the scenario of part one is for the protagonist to try to find a way to get on the good side of two warring factions so that he can leave without either one getting on his case about it, so you can imagine it's not hard to develop plot holes for something like that. My road block this past week has been trying to find ways around those plot holes. Oddly enough, my continuing training in scientific writing I think has helped me out with this type of thing greatly (namely in being able to focus on the details while maintaining the big picture in my brain), though I find it's extremely hard to get it perfect. Hence why all those amateur internet movie critics who spend twenty minutes at a time nitpicking things to death are real assholes (unless they've actually tried writing screenplays themselves, of course).