What tips can you offer someone who wants to get rid of bad memories?

You seem to be : Talking about traumatic experiences or events. Engaging in good psychotherapy dealing with these events is essential. Somatic experiencing and emdr are two modalities that demonstrate excellent outcomes.

Hypnosis: Hypnosis, or some form of inner focus, can be a powerful tool, allowing you to create emotional distance from bad memories. Often our memories are confabulations, a mixture of actual recollections, dreams, things we have been told, and our present reality. In guided imagery, or even emdr, we can explore our memories through our observing egos, and then let the bad go and reinforce the good.