I have moved my big Henlei twice now. There is no easy way. The easiest way to describe my experience is watch free willy and imagine a pond net.
For 8 incher get a big pond net and if they get caught up get some big welding gloves and untangle them. You should have no problems. I find the males are far more of the Aholes when you try to move them
I use large fish bags, the ones that line the inside of the shipping boxes. Sink the bag to the bottom, guide the ray in, lift to the surface, and drain some water out of the bag before removing from the tank. I don't get wet this way.
rubbermaid bins. With rays that small you should find one at target or Walmart cheap. Scoop them up. They aren't out of the water and the tail can't sting you or get caught in the net.