As a staff 1 your team will always assume you no idea what you are doing. So it is okay to mess up because they expect you to. As long as you get all lunch orders right and show effort, everyone will love you. Also, always ask questions. If you even thought about asking a question for a split second, just do it. They are expecting it.
For everyone who is thinking about accounting, I suggest you to check out this site: http://goingconcern.com/ It will give you up to date news on everything related to accounting. Best of all, it isn't dry at all.
For those who are interested in EY, the following links are a must read/watch.
1) http://www.youtube.com/watch?v=ISC-1zt7a8A
2) http://www.youtube.com/watch?v=AhPlFM6ohfY
3) http://goingconcern.com/post/busy-intern-will-not-let-silly-work-get-way-important-things-getting-his-tires-rotated
These aren't really accounting related but everyone at EY has seen these so if you mentioned any of the above at a recruiting event, I am sure they will remember you.