You should notice favorable results when you listen to the tape once the night before a day when you will experience "balloons."
Then listen again the night before the next time for reinforcement. A few times ought to do it.
If it is a severe phobia, then follow the instructions that come with the tape which says to listen to the tape once a day, alternating Sides A and B, for eight days.
Anxiety-Free has very high customer satisfaction. Go for it. If you don't get the results you want, post a message here, call for a coach, or return the tape for a refund.
There are also stories about the tape in the Paraliminal section.