You gather energy into your hands by pulling energy into you from your surroundings or pushing your inner emery to your hands. This is done by your will; intent; purpose; thoughts. Whichever you'd like to call it. It's your intent that pushes and pulls the energy. For example, you think "I want my energy to move to my hands," and you focus on that intent and the act of getting it done. And you just get it done by sending the energy to your hands.
People are going to have different ways to explain things. And we all interpret what is said/explained differently. So it's completely understandable that you say it's not explained well.
But in all truth there's no easy way to do things; nor difficult way. Your own perception gives the affect of easy or difficult. Find what works for you. An explanation that you can better work with. Or just figure it out your slf through effort and practice and come up with your own explanation that you can fully understand and comprehend on how the practice is done.