My friends are performing a show, and they invited me to help. They couldn't find anyone else so I agreed, the problem is, I'm a horrible dancer. They've agreed to show me the choreography and the steps, and I'm sure I can get those down, but I'm just so stiff and not fluent

Any suggestions on that?
Any any tips with hip-hop?
I need some suggestions/tips, and any information would be helpful.
Thanks!