I write a lot from instinct. But as you're writing out of instinct, once you reach a certain level as a songwriter, the craft is always there talking to you in the back of your head...that tells you when it's time to go to the chorus, when it's time to rhyme. Real basic craft... it's second nature.
Janis IanI played for anybody and everybody from the time I started playing guitar, when I was 10 or 11.
Janis Ian