[ProblemFactory]

I do freelance work for people who want apps built according to their vague vision, and don't have experience with the strategy-level consulting myself. But I assume the step up would be similar to the step up at not needing precise specifications and asking the client about each ambiguity.

An important point not directly mentioned in the article is: as you start doing more expensive consulting, you should also find new clients. Clients who do require the services and are willing to pay a premium for them.

While it's sometimes possible to charge a premium for a simple job, I find more honest to carefully explain the cheaper options (other freelancers, elance) to them first.

Setting up Wordpress could be "strategy" or 2 hours of sysadmin work depending on the involvement of the client. If they know that they just want a Wordpress setup, they could get the service for cheap elsewhere, and it would be appropriate to inform them of this before accepting. If they want a "website that my assistant can update", then choosing a platform for their requirements may be the experience in technical decision-making they are paying for, and actually setting it up Wordpress is a small part of the service.