A common question is, if I believe "x", how should I live? This is certainly a serious issue for a hessian in modern society, I can think of three potential ways...
The first is the one advocated here, the middle way. Listen to good metal, support good causes, get into a career where you can do something constructive, raise a family etc. This will be the most common path for intelligent metalheads.
The next two options are for minorities but should still be viewed as valid.
Firstly, withdrawal from modern society, a metal monasticism so to speak. These people would spend their time advancing their spiritual insight, performing metal rituals and undertaking academic tasks necessary for the advancement of metal.
Finally, become a metal anti-martyr. Work yourself into a frenzy listening to Slayer and then go on a murderous rampage. This should also be viewed as a valid option for hessians even though few will undertake the task.
More suggestions...