Prepping the trigger as you extend your arms out to index the target is an advanced technique. Prepping the trigger before you even extend your arms (as you have suggested) is a bad idea...to put it mildly.
In either event...not something you should be suggesting to a prospective BB student.
With all the thousands of pics we took at the Provincials and others I know I have a good Picture for this, but this is all I could find right now, Notice that the finger is nowhere near the trigger....and it won't be until the draw is 95% finished, I generally don't touch the trigger until it's fully mounted.






















































