Questions for people who used internal clicking nails (gnail, albizzia, etc)

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1. What are the most common mistakes people make that make it easier to accidentally miscount clicks?

2. What are the most common body/leg position mistakes people make when trying to do a click?

3. What are the pros/cons of clicking nail (gnail, albizzia, etc) versus precise 2.2 for internal tibia?

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"1. Not recording clicks. Also, not being careful after the lengthening phase and accidentally clicking without taking record."

Do you think for most people a simple paper/pencil small notebook with tallies is the best way to record clicks?