yes-I have two kids and use them alot
Also I play the comfort zone cd out loud and it helps to relax them both (they were both hb babies).
I taught a dad who had some exams shortly fter the birth of his baby, while doing the classes he mentioned he was worried about not having time to study after the birth of the baby, and the exam was expensive and he wouldn't be able to afford it again. I heard from him a few months later, he said he got into the exam, and forgot everything, then he heard my voice saying 'and you can use these techniques at any time' so he did the 5-4-3-2-1 (progressive relaxation) and was then able to do the exam-and passed

So the HB techniques are things you will be able to take with you and use again!