"We reacted more strongly to frustrations than normal people. By reliving these episodes and discussing them in strict confidence with somebody else, we can reduce their size and therefore their potency in the unconscious" (letter 1957)
This is what I did in my 1st 4th step and what I pass on to others:
I found a quiet, comfortable place where I could be totally relaxed & undisturbed. Then, I went back in memory to everyone I could remember in my life , starting with early childhood. I'd recall occasions where we were together and relive them in my mind. Then, I'd pay close attention to my body. Was I tense when I thought of this person? Did I frown? Did my breathing accelerate, my heart beat faster? Did I feel hot, want to jump out of my skin, crawl in a hole?
Each person that gave me a physical reaction that was less than pleasant, I jotted down. I didn't try to figure anything out or analyze it, just go on to the next person & so on. Later, I took a closer look at the ones that I reacted to & if I couldn't make out why, I'd discuss it with my sponsor.
I've found that my body has a wisdom that totally bypasses my conscious mind!
It's aware of things that my mind hasn't comprehended yet. I have learned to pay attention to it!
Once I was hiking & my body began to tingle all over. (No, I was alone. No romance!
) I didn't understand it till I walked about 10 more feet & saw a rattlesnake
So, this can have practical applications besides the 4th step!
It's been useful for me & others. I wouldn't worry too much about not having "enough" resentments. Just do the best you can as honestly as you can. More is always revealed!