No one is going to give you an extension at that point. Think like a professor. Most professors say it takes about two minutes of preparation for each minute of lecture. Produce good diagrams. Having quality diagrams or charts can improve your mark, especially if they are original and represent your knowledge of a topic. You don't need to spend money on software when web-based diagramming tools like Gliffy are free. Your professor has a job and a life. Do approach them for help, but do it during their designated office hours. Lecturers have a memory for students who don't display respect, and it can affect your mark in the long run. Showing willingness to learn may be sufficient to win that extension. Don't wait until the last the minute. Don't be the student who went to the teaching assistant five minutes before a paper was due to profess they didn't understand the assignment. You know the kind: the ones assigned on the first day and due close to the last; the ones you feel intimidated by and want to ignore as much as possible. Get to know what your professor wants. Studies show that getting to know your instructor improves your chances of success in college. Understand them. It's key to your success, as it can lead to mentoring, which is valuable if you plan to do graduate work.
Purdue OWL: Research Papers
Don't use online term paper mills. Papers purchased from websites tend to circulate, increasing the chances that your professor already knows about a specific paper. Some of them are also hopelessly outdated.