I am curious what can go wrong when popping? Give me an example of injuries you have seen doing so, and often did such a thing occur?
What doe it matter that if someone is dealing with a nice BP they should find someone that did it over 20 times?
Does not make any sense, then again
To the OP the reason why you want to have someone showing you how to pop rather then learn by watching a video (which is possible to do) is simply because with a video you do not get a real sense of how much pressure you need to apply.
What is important is proper placement of your fingers and applying proper pressure, which people often fail to do because of their fear to hurt their animal.