Of course you're excited and want to get a leg up, but enjoy the time off before you work, no need to pre-stress, there will be plenty of that to come!! That being said, honestly, some advice would be to learn that it will be challenging and difficult at first and dont sweat the small stuff. Be mentally tough and prepared to take criticism. You might (will) feel like an idiot a lot at first. That will sllllooowwwwlllyyy go away. If you can learn to be competent at work, the confidence will eventually come. good luck!