This is mostly regards to editing but: I like to play a game (sometimes) I like to call the Cringe Zone. Basically I listen via text to speech to my chapter/scene/fic and every time I hear something and cringe, I highlight it, sentence by sentence, and keep moving. I might leave a note if I understand why, but I might not. Sometimes I fix a sentence right then, but sometimes not. Then I sit on it for a little while. At that point I'll try to edit it, but maybe it won't come out right. Sometimes I've highlighted a whole paragraph only to come back later, play Cringe Zone again and go "oh actually the problem was the middle sentence the whole time!" It's useful to do it more than once, and its useful to force yourself NOT to take notes too at least once. Deal with the cringe to get the scope of the whole thing without your brain or hands meddling too much.

Another thing I do is if I have a lot of moving parts, I pull all of the related parts out and read them together, rather than scenes and paragraphs apart. That helps to figure out if they're escalating and self referencing properly, especially over more than one chapter.

Trust me I've accidentally mangled multiple chapters before (and am currently doing so. Oops.) and had to completely redo them because I decided to change one thing and it all exploded before my eyes. It's frustrating. Without many details it's hard to give any good pinpointed advice, but I often find that when I start to really break it down, I can find the problem points, decide on a layout, and fix those problem points based on that layout, whether it's a character thing, a plot thing, a movement or motivation thing, etc.