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Remember: headhunters can't give you a job, which means it's not your job to go about the business of impressing them. It's your job to go about the business of proving that you fit the bill for the opening. You need to be upfront and frank with a headhunter when it comes to compensation requirements, your experience level, and the other qualifications for the job. There's little sense in wasting time with opportunities you're inappropriate for. It is important to be well put-together for meetings with headhunters, since you're going to be representing them as much as you'll be representing yourself at the interview. If you look disheveled and like a poor candidate, the company will be less likely to go through that headhunter again. The headhunter's goal is to match people and companies, and you have to have information to do that, but it needs to be summarized and condensed into a manageable and tiny chunk for the headhunter. This includes a good resume, a short blurb, and additional background information from a phone or in-person interview. Recruiters then have a better idea if you fit that client's culture as well as technical requirements. And sometimes the information that you give the recruiter may open up another position that will be an even better fit. Don't expect recruiters to pour over your resume, or even be familiar with it. The average resume gets approximately 5-10 seconds of glance time. Get your headhunter to give you as much information as possible before an interview regarding the company and the people you're interviewing with. Ask your headhunter to confirm how other candidates who have interviewed for the same job you are interviewing for have failed so that you avoid making the same mistakes. If the headhunter has worked with this company before, there may be some helpful information out there. Don't expect a wealth of inside info. It'll be your job to get ahead and figure out how best to sell yourself in the interview. The headhunter can only show you to the river, but can't show you how to drink. Ask for honesty. Lots of headhunters want to provide a variety of candidates for jobs, even if they're unlikely to get it. That's because companies will think more favorably of the headhunter who provides lots of great candidates, compared to someone who provides just one perfect candidate. It's still your job to get the job you want. Again, headhunters aren't there to guide you through the process of applying or getting in touch with the company, figuring out what information you'll need to provide, or other materials. Some headhunters may offer some guidance, but you shouldn't expect it. Remember that it's your responsibility and stay focused on doing it alone. Treat any outside help you get as icing on the cake.
Be as honest as possible. Boil down your elevator pitch. Ask for inside information. Stay organized.