Paramount: Yes, messing with torsion springs will get you if you are not careful. Need correct tools too.
Flu: Not sure what you mean balance. Are they the same diameter? Measure the inside drum dia. where the cable winds. Door level? Door down, carefully back off all spring tension, slack drum bolts, hand turn enough to take slack out, tighter bolts and repeat other side. Equal turns on each side of spring ( if dual springs ). Tension enough to hold door in any position without connection to opener.
