And boy did /u/FRIENDLY_CANADIAN respond:
Fake it till you make it; confidence is more important than knowledge.
Act confident at all times. You may doubt yourself, but so does everyone else. You just have to remember that even though some people might be experts, everyone is just sort of winging it and hoping everything goes alright.
Don't be intimidated by anyone, everyone is playing a role and wearing a mask.
This sort of goes along with the last point. Everyone is winging it. Some are better than others at it. Some have more experience. But you just have to remember that everyone is human, and any failure you make will most likely be forgotten very shortly.
Don't be afraid to ask questions; it makes you look interested, and you will learn something. Anything can be learnt if you put the effort in. Everything anyone knows, they learned along the way. Everyone, even the president. Ask open ended questions to move conversations along. Learn the difference between open and closed questions.
This is such an important point. The only way you can learn is by asking questions.
Go to your managers with solutions, instead of problems. Make their job easier, learn how they work, and then ride their coattails up the ladder.
This is yet another important point: Manager are busy. Just because you don't see them doing work doesn't mean they aren't. They have the expertise to make the business run smoothly behind the scenes. When you have a problem, determine a few solutions to it, weigh them as if you were in charge, and then approach your manager with a convenient solution to the problem. You'll likely be thanked and remembered!