You don't. Why would you. I don't follow. You talking about moving from soil into hydro. As the pebbles you just put the pots straight into it. But you can't move soil plants straight into hydro.
But you can, cut it out down place what you can in a net pot, only by doing it like that can you. And the shock no matter what you do, will be too much.
There's a reason why you can't find material on it.
Cause you don't do it bro. You'll get a better grow leaving them be.
Good luck.