Muzzy, you can see the rest arm drop away. Draw the bow back and 'slowly' let her down (WITHOUT firing thebow)...if your timing is close to 'perfect' you'll see the trigger fire about an inch or so before the string settles at brace.

You can also spray the powder on the arrow shaft and you will see the prong lines travel all the way down the arrow and about5"-6" from the nock theprong lines ends..telling you how far down the shaft the arrow sits on the prongs.