If you wish, I can direct you to some of my client's sites where successful placement has been achieved. Don't expect miracles. Each search engine has a different criteria for ranking pages. While a given page may rank well with one or two, it may be a flop with the rest. Add to this the fact that the search engines are constantly evolving and fairly regularly change the rating formula.
New pages appear at the top and old pages vanish.
The most successful sites consist of many pages designed specifically for each search engine. Now don't panic at the thought of staggering costs for your site. Good placement of even one page on a major search engine can bring you plenty of traffic and potential clients.