Ryan,
I am going to try the ISA myself in February, I have a friend in it, he teaches a three day course, and then the fourth day you take the test. I hope it is not as hard as the Maryland Tree Expert exam. I just took that and passed 5 sections and failed 5 sections. I thought that was pretty good being the test should be called a Maryland Tree Genius. The bummer is I have to retake the whole exam again. And I hear the ISA Certified Arborist is just as tough. Anyway good luck and I hope you pass. Get the study guide too. They say it is real good material.