the interview process was pretty simple. sent schedule to professor and was asked about availability and applied online from the advising office. usually you can just ask the professor if you can be a course assistant after you take their class.
I applied in-person. The process took 2 days. I interviewed at Binghamton University (Binghamton, NY) in Sept 2012
Interview
Talked to the professor whose class i took the previous year. She briefly went over my resume and transcript. I had an A in the class and knew the professor fairly well.