Thanks a lot guys
I'm going to make the calls tomorrow morning, wish me luck! :P
OnTides- I really like your idea of letting them lead the conversation. I find I get more self-conscious when I say "Hi, my name is....I'm a third year student..."
I'm going to prepare some brief notes, just in case I get stuck. And yes, Jess, I think deep breathing would be helpful.
Thanks for all your advice- it makes me feel better, knowing that I'm not the only one with phone anxiety.