I love the position, but you better have good relationship with your ETL-AP and have shown that you can work hard, etc. etc. or he will not pass you in his interview. He has to be able to trust you to keep your mouth shut, show up for work, not be involved in any workplace drama (that's a big one compared to the rest of the store/high school that we work in) and be able to work independently.
Your usually by yourself with nobody really watching over you, you have to prove that you can keep busy and get results without being told to do something. Oh and keep the scores green to keep your ETL-AP off the radar of your APBP and you will have a very good life.