Pitisukha or delightful/beautiful breath not arising?

I am doing meditation as narrated in following steps by Ajahn Brahma to attain to Jhanas. 1. Present moment awareness 2. Silent Present moment awareness 3. Silent Present moment awareness on the breath 4. Fully sustained awareness on the breath 5. Fully sustained attention on beautiful breath 6. Experiencing the beautiful Nimmita 7. Jhana I have reached the stste of **Fully sustained awareness on the breath** for last couple of days now. But the pitisukha or delightful or beautiful breath is not occuring. Am I lacking ekkagata or concentration? Its getting boring to remain in this state for half an hour. Also, at what stage does the sense of body disappear? Any suggestions?