Absolutely yes, there is an information that says, for the success of any project, it must be through 20% of individual skills, behaviours, strategies, plans.. and 80% through a psychological way (internal conflicts), I see that some people who want their project to succeed, have a psychological problem, that's why they fail to achieve their goals, and the big widespread issue with many of them is the negative thoughts like that " It is difficult to achieve my goal " ," I cannot solve these  problems " and other . The mind does not differentiate between negative and positive thoughts, it achieves messages, orders or ideas  which you send to him. So if you want your project to succeed, first  think positively.