Hey,
I am definitely in the same boat as you! I have previous Java, and C programming experience in University, and I started a coop job. One of the things they wanted me to implement an iphone application side of my program...and I had never touched the objective C, or iphone programming environments. Having been to university you know that in all programming courses they come attached with a lab for some hands on experience, and to learn by trial and error. If I were you, I would draft up a basic program, and what you want it to do...and then try and make it. It may not work, it may not be designed properly, or be interesting - but at least you will be learning.