So you're looking to get something created – a web site, a graphic, a bar chart for your presentation, whatever. If you search online, you'll find scores of talented people who can produce professional work. They'll probably use the latest techniques and all their skill to turn your concepts into a finished product.

Knowing this, how do you choose a designer out of the teeming masses?

You pick the one who can communicate ideas.

Techniques are easy. Ideas are hard. They're also more valuable.