"I've always been like this"
You probably have a story you tell about yourself, and it may be a good one. The dissertation written in the final four days. The pitch finished in the back of a taxi. You tell it well and people laugh, and there's pride in it, some of it deserved. It takes nerve and ability to pull those off. "I'm a last-minute person" is a comfortable thing to be, and it has a bit of swagger. The alternative looks like the colleague with the colour-coded planner, and you don't want to be them.
When it isn't a funny story, it's a grim one. "I'm hopeless. I did this at school, I did it at university, and I'll be doing it at seventy."
Both versions make the same claim, which is that this is a trait and it's built in.
A trait would show up everywhere, and chapter 5 showed that this doesn't. You're prompt with the slides and the expenses. You were probably prompt this week with something for a person you didn't want to let down. What you have is a particular response to a particular trigger, work that measures you. My guess is that you learned it early and that the relief in chapter 2 has rewarded it thousands of times since. At school it may have worked very well. A bright child can do homework on the bus and get good marks, and the lesson that child takes away is that the last minute is enough. The work got bigger over the years, and the method never came up for review.
I won't pretend temperament plays no part. Steel's review found procrastination tied to impulsiveness and distractibility, and people differ in those from early on. Some people find this harder than others, and you may be one of them. But a tendency isn't a fate. If you have the tendency, you need a method. It doesn't follow that no method will work.
The grim version needs separate attention, because it feels like honesty, and even like a first step towards change. Being hard on yourself seems the least you can do. The evidence runs the other way. Fuschia Sirois looked at four groups of people, three of students and one of adults from the wider community. Those who procrastinated more were less kind to themselves and more stressed, and the harshness appeared to account for part of the stress. Those were snapshots, so they can't show which causes which.
A second study followed people over time. Michael Wohl, Timothy Pychyl and Shannon Bennett tracked 134 first-year students across two rounds of exams. The students who forgave themselves for putting off revision before the first round felt less bad in the weeks between. They also put off less before the second round.
That fits the mechanism in chapter 2. The swerve is an escape from a bad feeling. If every thought of the proposal now arrives with "and you're pathetic for not having started", there's more bad feeling attached to it and more reason to swerve. Self-criticism feels like pressure to do better. In practice it feeds the thing it's attacking.
The obvious worry is that if you let yourself off, you'll never change. But forgiving isn't approving. You can think the late start was a mistake, want to do it differently, and skip the sentence of contempt. You'd manage that for a colleague without effort. "You left it late, it was a rough week, so what's the plan for the next one?" That tone gets better work out of people than contempt does, and you're one of the people.
As for the swagger, you don't have to become the colleague with the planner. Nothing here needs a change of personality. It's one fifteen-minute action on day one and a few booked sessions. You can keep the nerve and the speed, which are real skills, and the early sessions will use them. You might miss the drama a little. I'd guess you'll miss it less than you expect, around the second Thursday night you spend asleep.
Next time you catch yourself saying "I've always been like this", try the more accurate sentence. "I've always done this with work that measures me, and until now I didn't know why."