"Just trying therapy" is akin to taking some OTC painkiller before going to the doctor. You try that first before going to the ER for a headache. Likewise, therapy is a really solid first move when something is wrong. For many people, and for many things, it will work and is the right answer. Many people go to therapy a few times, get some perspective, learn some new coping skills, and then move on with life in a better place.
Now, if they try that and it doesn't work, by all means, go farther and talk to a psych professional who can diagnose them.