Too bad! Most students dont learn the secret that makes writing essays easy - all they have to do is follow the same format every time. Usually the topic of the essay assignment is posed in the form of a question. There is never any doubt about where to begin - the first sentence of the essay should answer the question! After that list some reasons supporting the answer. In the following paragraphs provide details to back up those reasons. Each paragraph should deal with only one reason. Come to a conclusion.
As an essay writer your main task is to research and develop a coherent argument within the quite formal structure of an essay. Grammar spelling and punctuation are extremely important when writing an essay on a subject which calls for good language skills - English Literature for example. However an essay on other subjects also needs to adhere to similar grammatical standards. The rules of grammar exist for a positive purpose such as ease of communication and to avoid ambiguity not simply for some arcane reason lost in the mists of time.
The perception that no part of the essay writing process can be "systematized" (i.e. repeated over and over again) is flawed. It overlooks the fact that the structure of virtually every type of essay follows the same format. American high school English classes focus almost exclusively on the content of an essay. Since each essay assignment deals with new subject matter students assume that all essays are different. They dont realize that "topic" is an irrelevant factor. There is very little discussion about the format of a properly structured essay.