If you're like most of us, you have a few people in your life that are (how can I say this?) "not lovable".
But how do we do as we know we ought in the situations? We could simply bite out lip and "love" them but I don't think that is the spirit of the command.
I believe that we aren't being asked to Love like "I love my children", but not wish them evil.
When we look at it that way, "loving" is a "doable" act. And in a way it's a reflection of us walking in forgiveness.
Be well. And stay walking in the kingdom.
Gabriel G