I've tried popping and I think I'm being too gentle. I need to find someone to show me how to do it properly, I'm afraid if I apply too much pressure I'll cause irrevocable damage. Probing on the other hand seems much more straightforward so a better choice for me since I don't know anybody in the area to show me firsthand how to pop. Thank you all for your input, ideally I'd like to learn both methods so I can double and triple check myself.