Choose a translator who is competent in your field or industry. Commissioning the "lowest bidder" may be tempting, but what about the final result? Will you really get your money’s worth?
Specialist translators know their areas of expertise well enough to deal with a broad spectrum of subjects in a given area—and if they aren’t qualified to do so, who is?
With few exceptions, professional translators translate in one direction only, that is, they work into their native language. This way, they are sure to reach their targeted audience. After all, a single unintended nuance is all it takes to undermine months of marketing efforts.