When you get a good stock of the keywords that are important for your website you can indulge in some specific research to find out how the site ranks on Google or on other major search engines.  You might know off hand the status but going a little deeper into it could really help.   

Some provider companies who are helping their clients for   search engine marketing have come up with software tools like the seo digger and others.  Such software can perform the analysis part without your direct intervention and give you the results. However if it is your own site that you are verifying it would be better to have a third party review of the same.  

Keywords are important for search engine optimization.  However you must not indulge in keyword stuffing which is not good and it could give you a false positive view that may not be correct. On the other hand unless you know the exact keywords to be used you will not be able to make your contents specifically focused for them.  

You should remember the proverbs “slow and steady wins the race” and “haste is waste”.  You should not loose patience on any count and should go exactly for the best options.   

You should also understand that search engine optimization could take some time and if you loose patience the results may not be good for you.