Well, I couldn't decide on twins or sidemount....so I had a go at both.  The hardest part was finding the right equipment to fit.  My biggest advantage is that I am so streamlined.  For me Tec 40 was a breeze as hammerheads are used to going much deeper.  I found this training very advantageous as it now means that I can avoid getting a suntan if I stay close to the surface for too long - the only species of shark that this happens to is ...yep, you guessed it - the hammerhead!  Thanks to Cath and Jimmy at Camel Dive Club for taking me there.