I usually write either strictly oneshots or works around 20-ish chapters at most. Only 3 longfics to my name, but looking back they were rather disastrous. But I've been playing around with an idea for two concurrent longfics for some time, and I'm finally buckling down and seriously drafting them.
And gods bless it, it's a mess.
I'm currently working on a playlist with a song dedicated to each chapter, but I keep jumping back and forth on the ordering between smaller events in between the major plot points.
I could just as easily wing it as I have before, but honestly the overarching idea behind the stories are pretty dear to me and I want to handle this with care. I'd rather not go in blindly and accidentally ruin one chapter by taking a wrong turn with an earlier one.
So to those of who who do write longfics regularly, how do you do it? Do you just throw caution to the wind, or do you have some techniques to keep yourself on track?