Interface Builder Noob

I am new to XCode and buildng apps for the iPhone. I reciently decided to undertake a project with several friends where we are trying to develop our own app. As the designer, I am in charge of designing the interface. I already have a design in Illustrator, and now am trying to implement that design into XCode's Interface Builder. I am, however, having a difficult time doing so as I am having trouble accomplishing simple tasks such as changing the colours on the buttons or adding a graphical background. I have taken a look for some tutorials, but the ones I found that involved Interface Builder also involved lots of code and did not go into detail as how you would change the colours of the buttons and such. As my role on my team is just to implement my design and not worry about the code, I am having troubel finding a suitable tutorial. I am wondering if there are any noob friendly Builder Interface tutorials out there?