your trepidation is not without merit, imho.
here is what i hope for you. that you not allow yourself to suffer too much pain, too much damage in your efforts to realize gain.
card counting blackjack these days, offers only a small advantage. it's a difficult grind and doubtless the halls of its endeavor are lined with those who have failed.
from my perspective it takes a relatively huge bankroll, exposed to imho relatively huge fluctuation, within the relatively small long term risk. there are other simpler more advantageous modes of realization of advantage within the walls of the casino and without those walls.
point being, you shall learn and what you shall learn shall have imho, vast value, not so much in the specifics of what you learn, or even whatever monetary gain is existent visa- vs card counting,(edit: but wisdom in decision making, far more important than knowledge, (but you still have knowledge)), but in the very simple underlying value of obtaining a mind set that seeks and is able to find advantage.