Oh the piston drops. We love to hate them and hate to love them :)
Some find them quite natural to do and other struggle with them but eventually get them but for some it's IMPOSSIBLE!
Well the good news is that they are POSSIBLE to do so don't give up on them. But then maybe you should look into what you are doing wrong.
Here are some of the common mistakes in piston drops that could help you finally do them or improve your technique.
Hope this helps. Good luck!