Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).
When an airplane leaves from one city to the next, it has a plan. Its plan is called a flight plan. It's a massive action plan that involves speed, altitude, direction of travel and many other facets. But what happens when there's turbulence or air-traffic congestion or it needs to change course for some other reason? The plane changes its plan. But it doesn't change its goal of where it's going. Create and follow a plan, and don't be afraid to change it if you see something isn't working.