I do my own SEO. It works well  I get over 650,000 pv/month on my site.  It's best to learn it as it's fundamental to your website strategy.

Many people like Debbie above have learned from being here on AR. I do it myself with suggestions from all these great folks that share.

I do my own after years of working at it to get it right.  And it gets me about 100 registered leads a month (more visiters who don't register)

No PPC for me. 

I do all my marketing myself and rank higher than a lot of the big guys (i.e. Trulia and Redfin) on several key words.

I manage SEO on all of my sites myself. 

I am very happy and I am getting great results! 

I learned to do it in lean times (the Recession) and have continued to do it on my own.

I have not used a company for Organic SEO.

Organic, means you do not pay in my book.  Your website if done by a professional or someone savvy with websites should be SEO friendly by its architecture.  We use an expert that works on that.. A

? Organic?