To trust someone, of course, depends on our relationship to this person, on how we assess him or her to be able to take care of a task (or, for instance, our kids). We wouldn´t give our toddlers, say, into the hands of a 8-year-old – especially if he is a boy. But even with capable adults: to trust someone may sometimes be necessary but it´s not easy.
Trust means being able to let go of control – and hand it over to someone else. Do we really trust them, no strings attached, or do we rather expect them to act as it pleases us? I guess often we know exactly what the outcome should look like. When I, for instance, trusted someone with my under-12-year-old kids, I expected this person to bring them back safely (and in one piece) and not stuffed with sugar or traumatised after a horror movie night. I had clear ideas.
With our trust in God it should be different, of course. God is trustworthy – no matter what. He is also good and knows our best and wants it to happen; he doesn´t need our instructions. Annoyingly, we also think we know what´s best for us. And so our trust (and faith) gets tested every time something happens that we don´t value as good: we don´t get healed, we lose our jobs, or our relationship falters. To keep trusting God anyway and then to experience his presence, help and peace in challenging situations is the best thing that can happen to us.