I stumbled across this hint for how to change a cambelt on another forum. And to be honest, not sure how I feel about it.

The method involves cutting the original in half, so it is half its original width while it is in place on the car. Removing the outer half, slipping the new belt on, then cutting the remaining half of the old belt off.

On the plus side you'll make sure that the new belt is on with the cams set correctly, but on the minus side you are going to have to mess around no end to get the original belt cut in the first place, then introduce a sharp blade to the vicinity of the new belt one it is all in place.

So is this over complicating the issue of a belt change, or a foolproof method.