Keyword reserch is a service needed every second of the day,by all businesses that have web presence no matter what you do.
The services of keyword research personnel is in high demand as more people are turning to the internet to start their businesses.

I aggree with you that this is demand this days.
But can you give tutorial or guide to any person who wants to start this very service?

Online searches for resumes are becoming more popular as employers are becoming less attracted to the idea of paying for employee resumes.  Often an employer types in keywords that are common to the position that they are trying to fill.  Therefore, to get your posted resume noticed numerous keywords are imperative.  It is also important to use various formS of the same word to address many different searches.  Searched words that are often used describe needed qualifications including experience and skills.  A useful tool that enhances your possibility of getting a higher rank on the result list is a keyword summary at the top of your resume.  Using these tactics, you are more likely to get noticed.

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danieljackson, keywords reseach plays important role both in Search engine optimzation and  niche targeting.But important of  it does not necessary reflect demand, although depends on the part of the world the business is operating.

To enhance your website's visibility online, you need a keyword research tool that will supply keywords that are the most relevant and profitable for your website. . .  This will be used to develop your website's URL, TITLE, DESCRIPTION and CONTENT.
Keyword research tools does this by discovering keywords for you that are site-specific, proven to generate traffic and based on REAL data from your own log files on a daily basis.  Keyword Research Tools  gives you a Competitive Edge in the SERPs.
To conduct research to find new keywords for your website, you could:

1. Suggest keywords/phrases you THINK searchers might use to find your site.
2. Examine competitor sites for keyword/phrase clues.
3. Run queries in an accurate third party keyword tool like the ones google or wordstream provides.

The keywords generated from these exercises will form the bedrock of your content delivery (avoiding keyword stuffings and repeatition of course).  Be sure to highlight your keywords (make bold, italisized, underlined etc) where necessary because search engine robot crawlers detects such while searching for relevant pages for related search queries.
*You can easily find good keyword research tools by searching for the term "keyword research tool" in any search engine (like google or yahoo).