I have to concur with the other responders. It is really really hard to be an expert on all things.

The best SEO consultants will have areas of focus where they excel. They will know what these areas are and they will state them quickly.

When you run into a person who claims to be an expert in everything, you need to have reservations.

I've always stated that organic SEO is my strength and in particular, educating and helping clients set up a process that works long-term.

On the flip side, I openly state I know very little about PPC or any online advertising and that I cannot and will not provide assistance with those activities. I do this to protect myself and the client both.

The best consultants know their value and work to that end. And we back out when the requested task is not our strength.