How do you love someone who has done you wrong?

We've all had it. One person does one thing, and we've had it. That's it! They don't deserve LOVE, they deserve a piece of our minds, and it's not a good piece! I was there yesterday and I thought, how do I love them. They don't deserve it, I don't have it. How does this work? Jesus even told us not only to love our neighbors, but He stretched us further by saying, "Love your enemies." [Matthew 4:44] How do I do that? He said "love your enemies AND pray for those who persecute you." So, I'll start my feeble attempt at love by praying for them, now, sincerely. Lord, help me...