don't stress, everybody starts somewhere. Just don't go too crazy, what i mean is pace yourself. Even if you think you're ready for something pretty nutty, make sure you're 110% on your basics and fundamentals first.
I underrotated a corked 5 before i really should have been trying them and tore my ACL and MCL. I should have spent more time making sure my other spins were totally spot on first. Just a little advice. good luck though, have fun