What is good news is that with modern brain research and the mind (neuroscience, neurobiology, epigenetics) they have found that once you deal with even one mild trauma (and any trauma for that matter) that in doing so (with a professional or using such methods) you have told the brain HOW to file that trauma.

Not only does it file that trauma but will continue "on it's own" to seek out all such trauma in your memories and file those as well.

Pure and simple: you do not have to work through each and every trauma occurrence to heal.