I agree. Use a wakeskate 1st... Once you land one it's a pretty simple/fun trick.
One thing that has helped make the raley easier is concentrating on a good progressive edge. When I learned the trick my approach was full-speed from the moment I started my cut. Now, I concentrate on a more progressive edge... Start in slowly, then gradually build to max edge. For me, this adds A LOT more pop... Which gives me more time to get the board back underneath my body. When I used the full-speed approach, it seemed that I was getting very little pop... Which meant I had to muscle my board back in a hurry.