Yes! I like to think my life (relationships, work performance, hiring, firing, well-being) would have been completely different had I known about and understood attachment theory. (I have only learned about it in the last few years.) For me, it explains nearly everything in psychology that has been unclear or mysterious.
My go-to reference is
Attachment Disturbances in Adults: Treatment for Comprehensive Repair by Daniel P. Brown PhD & David S. Elliott PhD. [0]
It's a dry academic text intended for therpists that details the development of therapeutic approaches based on attachment theory, as well as specific treatment protocols for various insecure attachment styles.
Change is possible, as is working with people who have attachment difficulties.
George Haas, a meditation teacher in LA, has developed a way of using Vipassana meditation as a method of self-therapy.[1]
[0] https://www.amazon.com/Attachment-Disturbances-Adults-Treatm...