You can do SEO yourself. No one was born an SEO expert, so everyone started by themselves. This means you’ll need to handle every SEO aspect yourself, from research and keyword analysis to website optimization, ranking monitoring and analytics.
SEO is a comprehensive array of different services. And since each company is unique, what works for some businesses won’t work for everyone else. From many points of view, SEO is a mix of both experience and knowledge.
A consultant’s experience is one of the first things you pay for if you choose to hire a professional, rather than optimize yourself.