Guilt is like a large weight bearing heavily on your shoulders. You need to alleviate yourself of this burden by distraction. Time in itself will help in due course.

Accept the fact that you are capable of doing something that bad and do the good thing from now on.

To let it go, you must first welcome it.

By moving on and living with it.

I haven't found a way to, I just let it gnaw at my soul and drink to forget about it.