Read the part that matches this week
Not chapter one — whichever section describes what is actually happening. If everything feels too intense, that is part one and distress tolerance. Nothing else yet.
The most common way this goes wrong is reading all of it, doing none of it, and concluding it did not help.

Deliberately less than you will want to do. The initial burst is the thing that collapses.
Not chapter one — whichever section describes what is actually happening. If everything feels too intense, that is part one and distress tolerance. Nothing else yet.
One. Applied clumsily, at the wrong moments, with mixed results. That is what practice is; waiting until you can do it properly means never starting.
What happened, how strong out of ten, what you did. This takes less than two minutes and is the single highest-value habit in the whole process.
Not from memory — from the notes. Look for anything that repeats. One repeating pattern is worth more than a full read-through.
Resist moving on. The second week of one skill does more than the first week of a second skill.
There is no correct method. These suit different people and different periods.
Read it all without doing anything, then go back to what stayed with you. Suits people who find exercises intrusive on a first pass and want the whole map before committing.
Work a section fully before moving on. Slowest, and the approach most likely to produce durable change — provided you can tolerate the pace without feeling stalled.
Open at whatever is difficult now and ignore the rest until it becomes relevant. Least tidy, and usually the most realistic when things are hard.
Written down, once. This takes ten minutes and materially changes whether you are still doing this in six weeks.
There is a specific trap with practical books, and it is worth naming because it feels like the opposite of a problem. Reading about regulation produces a genuine sense of progress — things become clearer, patterns get names, the situation feels more tractable. None of that is practice, and the feeling of progress can substitute for it indefinitely.
The distinction that matters is between the parts of the book that inform you and the parts that ask you to do something. The informative parts are worth reading once. The instructive parts are worth doing repeatedly, and doing one of them badly for a fortnight is worth more than reading all of them attentively.
This is also why the three-line log matters more than it looks. It is not journalling and it is not insight work. It is a record, and a record is the only thing that can contradict your memory when a bad week persuades you that nothing has changed since you started.
If you take one thing from this page: pick one skill, use it badly for two weeks, and write three lines a day. That is a smaller commitment than reading the book, and it will do considerably more.
Understanding a skill and having a skill are separated by a great many clumsy attempts.