I've tried 'radical honesty' in the past, writing out exactly what I wanted to say to the person, and not holding back in any way and it felt GREAT! I highly recommend anyone trying this method...as long as you don't show it to them. Do whatever you want with it later, but getting it out is important. I like to burn a black candle to absorb all the energy of anger and hatred if that is present. Some therapists even recommend this method as catharsis.