Updated: Mar 3, 2021
Today I'm moving on to answering this question.
Put simply, it comes down to some essential ingredients - qualities that the therapist embodies - plus the quality of the relationship between the therapist and the counsellor.
It's important, too, that you are ready to engage with the process of therapy. In some circumstances this may take a little time. A therapist will do all they can to encourage you.
The animation posted below offers a pretty clear explanation of how talking therapy works. Hope this helps...