Many parts of the tapes either do not involve an e-collar or can be done without an e-collar. Indeed, the first several months of marking training all precede the introduction of the e-collar.
Much of the field training and yard drills could be done productively without the collar. However, the e-collar ultimately will enable you to refine your dog's training and gain greater reliability. You are likely to become more comfortable with the idea of using an e-collar when you see how it is very gradually introduced, and how it can be an integral part of a program that emphasizes communication and positive outcomes.