You landed the interview. Awesome! Now don't screw it up.

All of Jeff Haden's tips are excellent, but the first five really resonated with me.

First impressions matter.

Be calm. Be yourself. Say something memorable. Do research before interviewing:

1. Be likable. Obvious? And critical. Making a great first impression and establishing a real connection is everything. Smile, make eye contact, be enthusiastic, sit forward in your chair, use the interviewer's name.... Be yourself, but be the best version of yourself you possibly can. We all want to work with people we like and who like us. Use that basic fact to your advantage. Few candidates do.
2. Never start the interview by saying you want the job. Why? Because you don't know yet. False commitment is, well, false. Instead...
3. Ask questions about what really matters to you. (Here are five questions great job candidates ask.) Focus on making sure the job is a good fit: Who you will work with, who you will report to, the scope of responsibilities, etc. Interviews should always be two-way, and interviewers respond positively to people as eager as they are to find the right fit. Plus there's really no other way to know you want the job. And don't be afraid to ask several questions. As long as you don't take completely take over, the interviewer will enjoy and remember a nice change of pace.
4. Set a hook. A sad truth of interviewing is that later we often don't remember a tremendous amount about you -- especially if we've interviewed a number of candidates for the same position. Later we might refer to you as, "The guy with the alligator briefcase," or, "The lady who did a Tough Mudder," or, "The guy who grew up in Panama." Sometimes you may be identified by hooks, so use that to your advantage. Your hook could be clothing (within reason), or an outside interest, or an unusual fact about your upbringing or career. Hooks make you memorable and create an anchor for interviewers to remember you by -- and being memorable is everything.
5. Know what you can offer immediately. Researching the company is a given; go a step farther and find a way you can hit the ground running or contribute to a critical area. If you have a specific technical skill, show how it can be leveraged immediately. But don't say, for example, "I would love to be in charge of revamping your social media marketing." One, that's fairly presumptuous, and two, someone may already be in charge. Instead, share details regarding your skills and say you would love to work with that team. If there is no team, great -- you may be put in charge. If there is a team you haven't stepped on any toes or come across as pushy. Just think about what makes you special and show the benefits to the company. The interviewer will be smart enough to recognize how the project you bring can be used.

It's hard to remember all of these, so don't beat yourself up if you forget.

The key is practice. Keep getting better.

By the way, these tips are useful for networking, too!