1. When trying a new trick FIND SOME POW! Don't be trying new aerials in the park unless you know what you're doing. Ice is the worst, ground up is better than ice, slush is better than groomed, and pow just doesnt hurt.
2. Do the poles out of straps thing, I threw a big 5 in the park at my mountain and I have super loose straps, so one pole released but the other didn't and I landed on it and I have a giant bruise that hurts to walk on my upper thigh now. haha
3. Whenever possible, ski with somebody whose done the trick you want to try. You learn a lot about a trick just by watching, and knowingly or not you try to immitate their trick.
Try these things, maybe they'll help
Cheers!