Custom makes all things easy~~加油哦........................................
To stop making avoidable mistakes in project management one can also try attending good PMP classes conducted by any of the PMI registered REP's for gainig expertise best processes of project management. Any good PMP prep course will provide students with lots of actionable insights in project management along with preparing them for PMP certification.
I agree organizing systematically (ie, creating a process in place) is the most essential step. However, its easier said than done. Thats one area where its wise for small business to invest money on professional project management certifications like agile scrum certification courses.