No. There are many factors that can affect a birth, some of which are outside our control.
Also, like any childbirth preparation class, the success of the techniques is related to the amount of practice you put in.
However, as a guide, we find that around 65-70% of HypnoBirthing mums don't need any form of pain relief. Nearly all the mums in this category simply don't experience any pain - just pressure.
Around a further 20-25% only require something mild, like gas and air.
The remaining 5-10% usually fall into what we call 'special circumstances', where medical intervention is required. However, the HypnoBirthing mums still tell us that HypnoBirthing really helped - even if they were induced, or ended up with a caesarean.