If you have ever hunted with a firearm or have been taught at all how to shoot a gun, you should be somewhat familiar with the idea of being surprised by the actual shot occurring. We are taught to slowly squeeze the trigger until it fires. This is done to avoid punching the trigger, resulting in a twitch or other reaction that can knock our shot off course.
This concept is no different when shooting a bow with a release. You similarly must train yourself to slowly squeeze the trigger, until it releases.
Remember, SQUEEZE, not punch! This one small tweak in your shot process can pay dividends out in the field, when every small mistake is magnified.
Here is a video from Bowhunting.com explaining the basics of the surprise release and how to train yourself to do this.
For another video explaining the training process of the “assisted release” follow this link.