I usually do it this way
- Be super comfy doing it on a tramp, and also knowing the tricks close to it is helpful.
- Then take it to a decent sized jump with a powder landing, something your not gonna hurt yourself on if you fuck up.
- Give it a shot, if it feels like it did when you did it on the trampoline you should come very close to landing it and it will feel very comfortable. If it doesn't feel like it did on the tramp your probably throwing it wrong and it may be really tough to spot your landing or put it to your feet.
- After you get the rotation take it to the park.