Details of a cable raley

[Si]

Hello,
I am confident doing big jump starts off the dock, can do jump 180's and surface spins, ride switched and blind 180's etc.
So now I think its time I started attempting a wondrous RALEY!!!
now I have read loads of tips on how to dig your heels in, and keep your shoulders square with the cable (I am on a cable run by the way) but what I can't work out is where to position myself to start this trick. I am riding goofy - so should I be under the cable? or to the side?

What I could really do with (apart from watching an expert do it) is a quick drawing of where to position myself in relation to the cable, pylons, line etc.
Or a good description.

Unfortunately there isn't anyone at my new local park to copy - they are all the same standard as me.

I hope someone can assist

Cheers
Si