Good points above that I forgot. The only thing you cannot do from behind the prop is start the engine. EVERYTHING ELSE should be done behind the prop, where it is safest. Don't forget to always wear eye protection too.

I think the "twist-on" lock type igniters are worse that the "pull-ring" to lock type igniters for the problem mentioned because to twist you have to move one part of your hand closer to the prop. The neck of the igniter should also be as short as possible, as all igniters tend to lean a bit when attached, and a longer necked igniter will be closer to the prop than a short necked igniter if both are leaning forward at the same angle. The one I typically use has a 2.5" (65cm) extension.