In the case of some people who've repressed entire childhoods of abuse - talking to someone who may know or not know (say, a sibiling) can often confirm what you think you may be remembering if you think it's not true to begin with. In my case, I found evidence through letters, carefully asked questions to my family, etc. that what I'd repressed for around 8 years really was true. And as already said, things like diaries, calendars, etc. So it's all things like this that can "confirm" it.
I hope that makes sense.
There are people trained in dealing with repressed memories and can offer therapies that help, and it's important to try and seek one out if you think you may be recovering something.
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