The phrase "proper mindset" means having the right thoughts, attitudes, and beliefs to approach a situation or achieve a goal in the best way possible. Full definition
These books are listed in order of when they should be read based on setting the proper mindset and then gradually building the skills needed to succeed in sales. (inc.com)
«If you have the proper mindset, it can help you avoid 90 percent of the problems you might face. (entrepreneur.com)