Primary is the attempt to understand the will of God .Study of scripture , prayer and discussion in comunity are tools in this effort. Being sensitive to Gods voice is the ideal.
Since I am not equal to God, perfection is not expected , improvement is the aspiration, forgiveness is the grace of God.
The story of Adam and Eve , I understand to be allegorical and an explanation of mans nature , that we have both an impulse to sin and an instinct to understand that sin is wrong.These are inborn qualities that develop into the nature of a person as they grow , does a person allow his sin nature to rule or does he hearken to his sense of right and wrong ? Does a person nourish his sinfullness or seek wisdom to build his righteousness? None of us escapes this struggle even though for each of us the manner of the struggle is diffrent , for some the struggle is very painfull , for some surrender to error brings on pain, the natural aversion to suffering is often a pothole in the path , just as often an instructive goad onto the right path.
As children we are taught to be sensitive to our own conscince and to understand the basic instructions of Gods word, as life becomes more complex this process should always continue so that increasing maturity is marked by decreasing confusion. That confusing circumstances continue to occur I understand to be part of the testing and instructional nature of our existence on Earth.
The basic difference between a right thing and a wrong thing is understanding the thing in the way that God does . God understands completely , God loves Justice and also loves Mercy.
Only God will perform this discernment with perfection.
A Christian is encouraged to understand deeply, to value Justice and Mercy , the default position for discernment of the difficult is study of scripture , Prayer and discussion in community.