Methods for avoiding discouragement?

Specifically, I’m referring to study habits, or work habits. How do you stop yourself from being discouraged and stressed? How do you prevent yourself from ripping out your hair before finishing your task?

For instance, I know that if without the proper research material gathered, jumping into writing an essay or report will start to feel discouraging, and frustrating since it will take longer and with more stops to look for the required research material for the essay.

So, when you’re studying for an exam, what are some ways to not be discouraged? Especially if it is a subject that’s not your forte.