Learn, understand, and embrace the swings you are going to expose yourself to.
Don't get tilted too easily or at all (or at least minimize it's effect on your play).
Experience really is extremely valuable. Playing as much as you can will build this experience faster.
Do LOTS of studying/homework. I cannot stress this enough. Staying ahead of the curve is key. Chatting with other successful players is a huge help too, but just make sure you don't take too much different advice or you will just confuse yourself. As you gain experience you will get better at taking advice and etc from o