How can I know that Zen practice is right for me?

Well, only you can tell, and only on the basis of your own direct experience.

Buddha taught that every spiritual practice should be evaluated on the basis of its results. Nothing is to be taken on faith, nor does Buddhism make any claims to being the one true way. This means that practitioners need to decide, after making a sincere effort, if the practice is proving to be efficacious — beneficial to their lives as individuals and in their interactions with others. Zen meditation practice is directed toward helping us wake up to our true nature and help this world. If that is your direction, then Zen practice is certainly worth trying. If you practice with a good teacher hard and steadily for a good amount of time you will be able to know if Zen practice is right for you.