One of the things that has helped me to "pray for those who persecute me" is to not try to pray for all of my persecutors at once. I simply pick out one at a time. And, in a sense, by picking out one of my so called enemies, I am really dealing with all of them. I have figured out that all of the people I struggle with have a common denominator, and so by praying for one of them, I pray for all of them.
Every night I take my dog for a walk, and I pass by the house of one of my former persecutors. I actually like the person, but there has been a history of brokenness and division between us, so there is a grand canyon's chasm of disconnect. I have begun to simply, in a routine fashion, pray for this person each time I pass his door. My prayer is not particularly eloquent or poetic, but simply, "please be with !?!?!?". I also try to prevent my dog from peeing on this person's shrub...
I have only just started this process of prayer, so I am not sure where it will go exactly, or what I will learn or how I will grow from it, but I will let you know, pray for me:-)
All for Now,