[wittyreference]

In my advanced cardiac life support training, an EMT once put it this way (addressing some nerves at being responsible for a critical life or death event):

Their heart is stopped - they are dead. You can’t kill them any more dead, you can /only/ bring them back to life. So what’s to be nervous about?

Don’t pick it apart. It’s not hard to pick apart. But thinking about it that way really does help take some of the pressure off and let you focus on doing the deed.