First I sinned
A man once approached Rabbi Israel of Rizhin: "Rabbi," he said, "I so wish to repent, but I don't know what to do."
The rabbi replied: "And to sin, you knew what to do?"
"Yes, but that was easy. First I sinned, then I knew."
"Exactly," responded the Rabbi. "Now do the same the other way around. Start by repenting; you'll know later."