Learn to do it yourself. I found out the hard way.
I hired someone, who is actually very prominent in the SEO arena and writes for several of the big seo sites. I had several terms and payment was subject to getting my site to rank in the top 10 for any of 10 terms (I think it was 10 terms). I paid what I was supposed to pay and the final payment was the one subject to this stipulation.
Instead – he took all my sites down (because he had FTP access) and I had to re-do a LOT of my content because he either didn’t store it properly or was just mad. We solved it amicably, but I still lost lots of time setting up my forums again as well as other little things that cropped up.
In the end – learn it.