Dear Friend ,
Starting with the ideea that the whole universe is working beacause of multiple resonances that happens in time and space I only can advice you that changing a feeling or emotion is just a mater of resonance ... Deeper you will thought that you hate deeper you will feel the efects of this emotion ... so all you have to do is change the resonance thinking to anything else that could ofer you the posibility to a love feeling ... and with that i'm trying to explain to you that all your emotions and feeling are part of you as a mater of willing and resonance and everything depends on you ... How to change something with you in good or bad depends only on you ... I don't say that it would be easy to do that , everything that could be easily obtain so easily goes ... Not the effort leads to the end of your searchings but the extra effort ...
if you keep going with an obsesion in time the obsesion will become an habbit and it will goes deep in your subconscious and harder will be to take it out ...
More than that I will give you an easy exercise that will be usefull :
Take a sit in a confortable position , even layed down if u like , close your eyes and relax , follow your breath but do not interfere , use your hate as a theme of your concentration , let her to come up and feel the emotion intensive but not too long , long as you have the control is ok , then ask the question : Who is the one that feels this ? then try to locate that who ... further , you will see ... even if you don't get and answer is not important , important is the peace ...
Peace my friend !