First time cloning and first experience with rock wool. Help???

Hello, i have two bushed out beautiful mother plants that i am going to attempt to clone. It is my first time cloning, and my first time using rockwool. I have a rectangle box with plastic lid and just enough rockwool to fit in the box. I have rooting powder as well and a razor blade. What exactly am i supposed to do? I have never seen rockwool before am i supposed to boil water and bring it to room temperature and soak the rock wool for an hour the use it...PLEASE HELP lol
thank you
josh

You need to balance the Ph of the rock wool cuz it will burn the cutting. Make sure its humid around the clone so the leaves don't dry out before the roots are grown. Keep the rock wool wet too.