There are various Ways to do Search Engine Optimization for your site or blog. To rank high on search engines is not an easy task. Also it requires time for gaining better and constant SERPs. You can easily gain good SERPs for few days or weeks, but to remain on top for a long time requires hard work and SEO knowledge.
You can seek help of some SEO professionals or experts who can do the SEO services for you like link building, on-page optimization, content writing etc. The price varies with the type of service, your goals required and from person to person. For example, if you are in Devon, you can hire a SEO exeter with whom you can personally meet or can communicate.

Before hiring any SEO guy, do some research on whats the ongoing market rate for various SEO services. Also check the reputation, past work and reputation of that person or company. Beware of fake persons who call themselves SEO gurus certified by Google or MSN because search engines never support such SEO tricks.