I have / do. It takes a lot of self-discipline.
Your three bullet points is basic goal-setting theory. "What is the goal / how do I get there / what behaviors help get there" is a basic form of executive function, and how most people decide courses of action. It is not easy, because change usually involves discomfort and self discipline, doing things you don't normally want to do.
Self-discipline is about doing something because it is necessary, regardless of whether or not you want to do it. It is "necessary" because it tends to cause a desired outcome. I do not enjoy studying, but it is necessary if I want to do well in school. I could say "I do not like to study, therefore I cannot do well in school" - but I can also say "I do not like studying, but I am going to do it anyways, so I *can* do well in school, because studying, whether I enjoy it or not, helps with doing well in school". The hard part is the doing. Nobody wants to do things they don't want to do.
Most of my useful habits are consciously chosen and deliberately ingrained. I am who I have chosen to be. Usually.