I agree with the trial and error!
I use a lot of positive self talk. I look up positive affirmations online and write them a few times a day. I read the "daily word" everyday. (Even if you don't believe in God I find it to be a positive affirmation)
Daily Word
(Click on today's word)
Also as far as working goes.. Just doing it. I got two jobs now and I was terrified but I just believed in myself. Anyone can work a minimum wage job.. Easy stuff.. Just takes awhile to learn.. Just like grade school..

Positive affirmations: "I am grateful to be an irresistible magnet for miracles, love, and fortune"
"I can do all things through Christ who strengthens me"
"I am beautiful I am worthy I love myself I am capable, miracles await me"