I think you will get up
Keep trying, really. It WILL happen, and you will then be ready for the next stage...staying up! Dont rush if you want to continue in the sport...learn each stage correctly. I highly recommend "the book" dvd series. It defines the perfect learning stages and helps you build up to tricks.
Realistically, it should take a full season (depending of course how often you go out and session) to get up, learn the riding positions and edging positions, wake to wake jumping and finally 180's and switchfoot.
Once you have those under your belt, learning anything else is simply building on those basics which can be learned and practiced on a trampoline. Even flips and 360+ are just built on the basics you can master in your first season.