To properly teach yourself calculus, all students will require some form of external assistance, in addition to traditional learning materials. To succeed in calculus, you will need a deep understanding of many other subjects that will be foundational to almost all of general calculus. Every calculus course builds upon the foundational concepts from previous classes, from physical science to math for analytical calculus. Without some guidance, or having a tutor connect the ideas for a student, it can become unnecessarily difficult to be self-taught.