The regular chatting with a writer is very important as you are able to control the writing process in this way. Ideally, such a service should have a real-time chat for customers and writers. So, make sure of it in advance.
Some of those sites employ non-native speakers and writers without university degrees and that might impact on the quality of their works. To avoid this, read as much custom reviews as possible. You can also check the requirements for applying on the service as a freelance writer.
Apparently, it’s not your first writing task as well as the last one, so a teacher had definitely read your essays before and would easily spot a change of your style. That’s why a writer should preferably match it, and even the mistakes you usually make. Besides, it will be better to provide your training material for a writer to refer to it.
Religious professionals used cave paintings to bring good luck to the hunt or to cure the sick and injured. Fast forward to Middle Ages, when scribes used to write because there were a few literate people.
Therefore, if they are asked to write an essay, it becomes a real struggle. The only way out is to seek the services of a custom writer.