I have recently implemented this at home. But I only needed to configure DNSmasq. My phone (with Samsung default ROM) remembers the DNS settings per WiFi network. I only had to set the YNH server’s IP address in the DNS field of the WiFi configuration once. (No need for additional app)
Maniack_Crudelis’ tutorial was enough for me to set everything up. It is in French though, don’t hesitate to let us know if you need a translation.