I know this is an older thread, but it is full of good advice.
One thing I would ad is you may be in a class and it may seem like they are talking about something you already know and you start to feel like you "already know all this stuff", keep an open mind and don't bail on the class or zone out. The speakers often have to gear their lessons toward a wide audience with many experience levels, and may start out going over the basics that most people know. You may have to sit through half of a class that is reviewing "stuff you already know" before you get to the good stuff that is new to you.
This will be my first IUSA! On the way down, we're stopping at Zion N.P. for a few days, then off to Phoenix.
How exactly do you sign up for the mentoring in the print show, and what size/how many prints should I bring? I am excited about attending as it will be my first time as well.