The Tantra has not prescribed or recommended any kind of Siddhi Prayoga for this Mantra and hence it is a Siddha Mantra, which means it can be used without having to gain Mastery over the Mantra. However, in my opinion the practitioner should first completely memorize the Ram Mantra by heart before putting it into actual practice to heal the injuries of a wounded person.
The actual practice to heal the wounds of a injured person is very simple, the practitioner should chant the Ram Mantra thrice replacing the word Amuk with that of the wounded person and then blow his breath over the wound.
युध्द किये राम लक्ष्मण दुई भाई | वाल्मीकि ने मंत्र पढि बाण जन्माई ||
बाण से बाण कटे होय बाण बरीषन | बर्ध्द चन्द्रहास से कपै राम लछिमन ||
आदेश मुनि वाल्मीकि की दोहाई | “अमुक” की परिव्यथा कटी जाई ||
Yudh Kiye Ram Lakshman Duee Bhai | Valmiki Ne Mantra Padhi Baan Janmaaee ||
Baan Se Baan Kate Hoye Baan Barishan | Badhrda Chandrahaas Se Kapai Ram Lachiman ||
Adesh Muni Valmiki Ki Dohai | “Amuk” Ki Parivyatha Kati Jaaee ||