How do you implement the concept "less thinking more doing!"

I understand I'm just basically wasting time overthinking and living in self doubt, I think living this way will not cure any problems but infact just lead to more problems. Overthinking is such a dangerous situation because it's never ending. Now I'm trying to discipline myself on this concept of thinking less and more doing however I don't understand how do I begin this way. My main priority is finding a job because financially struggling. Now Ive been living in this fear of not finding good employment opportunities because I realize first of all my resume sucks as I don't have any education qualifications and work experience nor the skills. Second, my social skills sucks. I'm not carrying any confidence in myself. My posture sucks and voice isn't projecting because of low self esteem. And lastly, I overall feel like I don't have the mental capacity and resilience like most people do.