Read one section only
The one matching the situation above. Do not read further even if it is going well — the temptation to read everything is the thing that produces no practice.
Not at the beginning. Start at whatever is currently loudest — the front of a book is rarely where the problem is.

Four common situations and the section that matches each.
You need something for the next twenty minutes, not an explanation. Physiological skills first: temperature, movement, long exhale. Understanding can wait.
Go straight there. The general skills material will feel abstract while a specific relationship is the thing actually happening.
The crisis material will not resonate and that is correct. Structure and trajectory are the relevant parts.
Understanding the label first makes everything after it land better. Then professional support, then skills.
Deliberately small. The most common failure is an ambitious first week followed by nothing.
The one matching the situation above. Do not read further even if it is going well — the temptation to read everything is the thing that produces no practice.
One. Write down what it is and what counts as having used it. Specific enough that you will know afterwards whether you did.
What happened, how strong out of ten, what you did. This survives bad days in a way that journalling does not.
At the wrong moment, clumsily, with mixed results. That is what practice is. Waiting until you can do it well means never beginning.
From the page, not from memory. Note anything that repeats. One repeating pattern is worth more than a completed book.
The practical ones.
No. The sections are written to work independently. Reading straight through builds a fuller picture, but most people start with whatever is difficult now and fill in the rest as it becomes relevant.
Common early on — noticing patterns you had been steering around is uncomfortable before it is useful. If it persists for more than a couple of weeks, or you feel less safe, stop the reading and involve someone. A book is not the right container for everything.
Recognition within weeks. A gap between feeling and action within months. Fewer episodes takes considerably longer. People who expect improvement in weeks tend to conclude it has failed by week six, which is the single most common reason for stopping.
One person, if you can. Not the details — just that you are working on something. Being asked about it once in a while substitutes reasonably well for the accountability a therapist would otherwise provide.
Tell them you are reading it, and bring the written notes. Specific observations from the week are far more useful in a session than reconstructing a fortnight from memory.
Nearly every self-directed attempt at this fails the same way. The first week is enthusiastic — several sections, long notes, multiple skills. The second week is thinner. By the third, something difficult happens, the practice stops entirely, and restarting means confronting the gap, which is harder than the original problem was.
The prevention is to deliberately do less at the start than you feel capable of. One section, one skill, three lines a day. It will feel insufficient in week one, which is exactly the point — it needs to be small enough that week four, on a bad day, is still possible.
It also helps to decide in advance what this reduces to when things are bad. Usually the three-line log and nothing else. Having a defined minimum means a difficult week interrupts the practice rather than ending it, and interruption is recoverable in a way that abandonment usually is not.
If you take one thing from this page: pick one skill, use it badly for a fortnight, and write three lines a day. That is a smaller commitment than reading the book and it will do considerably more.
The plan you make while motivated has to be executable on the days you are not.