don't know what worked for cmos but for me it was recognizing that most of my self doubts stemmed from irrational fears such as being uncomfortable/scared around meeting new people. I'm a bit of a workout junkie so I decided to apply principles from working out to my psychology- I would take an irrational fear or something that made me uncomfortable and do incremental "mini-workouts" until I became comfortable and the fear disappeared. For example meeting new people- I started using every chance I had to start conversations with people I didn't know. Say you're standing in line at Starbucks and see someone wearing shoes that you like say "Hey, cool shoes, where did you get them?"
