Automatic Idle Adjustment One Person HOW?

ESP47 said
I just set the idle for what it's supposed to be in Park/Neutral and then put the car in gear and look at the RPMs.

I'm not quite sure if I'm understanding what's going on here. Why would you need to risk crashing your car or injuring yourself to save 5 seconds?
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Because the correct "by the book" procedure to adjust idle and mixture screws on an auto is idling and in gear. ....but I cannot disagree it's safer in neutral or park.