The demon slayers overcome their personal obstacles and fears through rigorous training, determination, and support from their comrades. They often face their fears head-on, pushing themselves to their limits in order to grow stronger both physically and mentally. Additionally, the demon slayers draw strength from their sense of duty to protect others and their desire for revenge against the demons who have caused them and others harm. Ultimately, by facing their fears and working together with their fellow demon slayers, they are able to overcome their personal obstacles and fears.