You will have much more range of movement than you have had before. Your back and you will know and appreciates this. There are some general rules about doing these exercises. All of these exercises are to be done in a most gentle manner. You will have to make an effort, but no grunting and straining.
All exercises are to be done in slow, smooth movements, never jerky.
Proceed on to the next exercise. At some later date, if you feel comfortable, go back to the exercise that caused the pain and try it very gently. If you have pain again, simply omit that exercise in the future. You probably will not be able to do all the recommended repetitions for each exercise at first, but continue to work toward it. You will become much stronger and more flexible.