Bitachon means not working (but learning Torah) and trusting that Hashem will provide your parnassah. Likewise, not going on dates (but learning Torah) and trusting that Hashem will provide you a wife. Likewise, not being involved in your children’s lives (but learning Torah) and trusting that Hashem will raise them for you. Likewise, not being involved in helping your community (but learning Torah) and trusting that Hashem will take care of them instead.
In short, the more Torah you learn, the more responsibilities you shirk, the better your bitachone is. Like several people said before, becoming a baal bitachon is not easy, but every step counts.