I haven't been able to enter SP or WILD yet, but I do seem to be able to DEILD. The first time I did it was by accident, I didn't really know there was a technique like that, then I did it another two times afterwards...

For me, it's a really odd experience. It sort of goes like this:
I begin waking up from an LD and once I realise I'm in my bed, obviously I don't move, but I don't think about not moving and I don't think about my breathing or anything either. I don't even think about the dream too much, it just rests at the back of my mind. Both times I actually tried to do it, it felt like it wasn't going to work or maybe that I was too awake, but all of a sudden I found myself back inside the dream.

I don't even notice myself going back to sleep or being taken there, it's really strange...

Keep trying!