If you are overstimating, track the amount of time you’re not taking in consideration and add it the next time. It’s called positive feedback. You’ll adjust your estimations in a very small amount of time.
I have been tracking time and it has somewhat helped. What I'm finding hard is that every project is so different from the previous ones. I can use my tracked time to estimate about 20% of the features of a new project, but the rest are things I've never encountered before.
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