Bah.. it just takes practice

Sure, sometimes the camera strap gets caught between the bands when you load your gun and your shoulder gets dislocated when you miss a huge tuna because you couldn't aim and the camera, which is attached to your wrist, goes with the spear - but at least your friends get to see how cool it was where you were trying to spearfish!
Bye the way, what gun are you using in your home waters these days?