Meet & Agree
You need to explain both requirements and the context of your work and discuss any specialist terms that may arise. Terms and a timetable should be agreed in advance. Translators usually charge per certain number of words, though most translators also have a minimum fee. A charge per hour may be levied in some instances, if appropriate. When you agree the translation rate for documents, you should ask whether it includes a charge for proofreading. If it does not, the rate charged needs to be agreed. It is important for the translator to ensure that the translation is consistent in style and terminology and of a high quality throughout.