it won't make your life safer. Once found out, being trans is much more dangerous than being a woman. There's a study attached below with statistical evidence that proves so. you are 5x more likely to be victimized if you transition. (study:
https://williamsinstitute.law.ucla.edu/press/ncvs-trans-press-release/) To be blunt, without any sort of medical involvement, it's going to be virtually impossible to look perfectly like a cis male. of course, you don't have blend in perfectly, but if your goal is to live safely this won't cut it.
for tips...I'd honestly see if you could work out, since it builds muscles and loses breast fat. There's also youtube tutorials on how to do makeup to accentuate masculinity that are def helpful. Also the way you dress and carry yourself.
transition for yourself and what you truly want, not for safety.