Your concern with your partner is experience on their part and the rope used. If a thin cord is used and the bondage it to tight you can cut the circulation to the testicals. This can result in castration if your balls are tiied long enough.
Yeah, I'd say start out with a thicker rope and make sure it's a rope that is easy to untie if you are using knots. Some threaded or nylon ropes can be very hard to untie. So I don't recommend those for tryouts.