Huge tip for anyone who wants to learn: get some time in a wind-tunnel.
I haven't done this myself BUT I know others who have, and I can really see how it has helped them enormously (and they claim it did). In freefall you have **** all time to think at first and it's all just bat**** crazy - the sensory experience is overwhelming with the wind and noise and feel of the air on your body. Being used to that already will make your mid- to late-stage training a whole lot easier and you will breeze through the course.