The closest a freelancer comes to dictating a full schedule of assignments is the cattle calls some agencies make to get an assignment filled. This is when they send out a mass email inquiring about availability which they admit is based on the first to respond will be the first to consider. The pivotal word in these inquiries is consider. The client (usually an agency) will take into consideration your rate and the reputation of your performance with that agency. Once your rates and terms are favored, inevitably what occurs next is if you are personally favored by the scheduler. Granted the more professional the agency, the less this behavior takes place. But in the high pressure job that schedulers face every day; the freelancer who is low maintenance and reliable is recalled fondly.
Learn the professional tone of how your client does business and work with them in that same tone or better. This rule is applied across the full range of clients from a single individual who contracts you to a small law firm or a multinational firm through a court system or agency. In each situation your performance and behavior decides how they judge you. Are they so busy that your repeated questions would bother them? Do you need to have them send back your invoices to be corrected? Do you expect them to research your assignments for additional information you need? These are common complaints among schedulers.
How much power does the attorney or judge have in deciding who is assigned to interpret? That depends on the feedback given to the attorney by his or her secretary. If the court is hiring you directly the judge can tell his or her court clerk who to use or not to use. Agencies do get some feedback but mostly, only when it is bad. The agency is most likely going to act on bad feedback if the relationship with the client is on the line. The more professional agencies take into consideration the context of the complaint about the freelancer and interview both parties before acting. If an agency passes on a complaint about you and is going to limit your assignments, be honest if you were improper or unprofessional. If you weren’t, ask to have it investigated with the client telling them that you want to rectify the situation. If it is not proven to be poor interpreting performance, the agency can easily avoid assigning you with that attorney or Judge and everyone is happy.