Accept you are already dead
It is not that easy. I think that becoming fearless has some steps but I don't know what that steps are ?
I have some theories.. this might make you fearless against anything living. each steps will make you fear less and less.
1. train yourself to never avoid eye contact (even when you lie).
2. learn that pain is inevitable, but suffering isn't. (took this from a film, but I've learned that it is true)
3. work out.
4. practice martial arts. getting past the basics is enough.
5. learn how to treat yourself for when you get hurt
6. hurt yourself. maybe start by dislocating a bone. after that you can do some things that can leave you permanent scars.
there. I did the number 1-4 and I feel like I can fight a tiger. serious.
I don't advise bringing weapons because it makes you dependent on it.