Just don't screw up. Its amazing what basic mistakes can happen because someone couldn't ask or take the time to do it right. Pay attention, give attention to detail, and keep your head on a swivel. When things get busy, I work at a slower pace as to not screw up. Don't be 'that guy' that yells over the radio when more than two things are happening at the same time. The learning curve isn't difficult, but that is just new guy, new job stuff. In six months you'll be comfortable. In a year you'll have seen almost everything that can happen. And also, think for yourself and take the initiative to fix issues that come up....no you are probably not in the position to waive a fee or give a discount to the customer, but you can always give them understanding, a smile, and let them know you are personally going to figure out how to make things right. Remember that no matter what you do, no matter how good you are on line, and no matter how good your disposition is, a few customers will get to you and never be pleased. Deal with it, and blow the steam off later, not on your co workers. It is a fun job, you will learn a lot just from being around it. Every day is most certainly different. Everyday will present new challenges for your skill set. Use where you are to your advantage to, I would have never gotten where I am today without working line in terms of flying, knowledge, and friends. Don't be shy to let people know you are coming up through the ranks.
Have fun! Let me know if you have anymore questions.