As you proceed, you may feel physical sensations, strong emotions or both. Stay with them and write them down.
Notice what you want to do to end this exercise. Postpone ending the exercise for from one to ten minutes. The minutes you spend in the exercise after you want to stop will provide you with more information. It's not necessary to push beyond ten minutes. You are stretching your tolerance in this exercise. You are also being kind, patient and accepting of yourself. Postponing from one to ten minutes will give you the strengthening and confidence building experience you need. More is not required.
As you postpone you build your own strength and endurance so you can bear more information. That's where your freedom is. Write down this experience too.
When you decide you have had enough, write that you have decided to stop. Also write what you intend to do in the next minute. Be honest. Then put your book in the safe place you created.
Reconfirm your next appointment with yourself.