Keep your head up, your eyes open with your ears to the ground (think extendable ears) - you never know where the slightest sign of an opportunity will lead you. Positive mindsets lead to positive opportunities...the Weasley twins wouldn't have opened a joke shop without belief and optimism!
Let's be honest, Harry wouldn't have defeated Voldemort if he'd been too overwhelmed by war and mass terrorism. He focused on the Horcruxes not Voldemort. Don't stress about what you're going to do with your whole life - think big but keep your decisions manageable!
Let's face it, the competition is tough out there. Quite simply, don't be shit! Check over your CV one last time for any spelling or grammar mistakes (or, even better, get someone else to). Be ready to think outside the box, find new solutions and be innovative. Get your game face on and think sharp like Granger.
Let's face it, Ron didn't have a very easy ride...knitted jumpers from his mum, being teased for being ginger, all those spiders, not to mention that he even walked out on the team when the horcrux hunting got serious. But he came back. With a smile on his face, ready to crack jokes. Working out what you want to do can be tricky, don't take the knock-backs personally. Lean on your good friends and grit your teeth through the applications!
If you're feeling pressured, remember, make decisions for yourself, nobody else. Don't ever change who you are to 'fit in'. You're the only person that should be making your own decisions about your future. The sceptics will deal with it, go out there and prove them wrong.