These sequences are meant for Iyengar students who have already been taught how to safely enter and exit these poses and who regularly practice inversions.
B.K.S. Iyengar created these sequences to help boost students’ immune systems. The first sequence has some long holdings, but just hold as long as you can comfortably do so. Importantly, don’t hold any poses if you find that your body shakes or there is strain. If any pose causes you pain, come out of the pose and skip it. When you return to class you and your teacher can work together on how to adapt the pose to resolve the pain.
If you don’t practice some of these poses in class or do not have the appropriate props to support you (especially for the shoulder stands), skip those poses and practice the others.