We used the rubber ones to practice on, and I agree, they are nothing like the real thing!
I have attempted two different times to start an IV in clinicals. Yes, I said attempted, both times I was unsuccessful.
I was very upset at first about not being able to get them started, but at least it made me feel a little better that the other nurses that tried after me couldn't get them either. Both patients were elderly and had already had multiple sites that had infiltrated. I just know that if I could get a patient with some big, juicy veins, I could do it!!
Don't worry, just review your procedure before your clinicals in case the opportunity arises, and make sure you have all your supplies on hand. You'll do fine!