Something nobody prepares you for is that the better you get at writing the harder it becomes. beginners write freely because they don't know enough to know what's wrong. then you learn. and suddenly you can see every single flaw in real time as you're making it and you have to write anyway while your own brain is in the corner going "that's a weak verb. that transition is lazy. you've used that word three times." getting good at this is mostly just getting better at ignoring yourself.
Sometimes I have to do the thing where you set a timer -- ten minutes is about the max in my experience -- and while it's running you have to keep writing and you cannot stop and you cannot pause and you cannot edit you just have to keep putting words down one after the other.
It's surprisingly hard but sometimes you gotta pull out the big guns.
