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This. In fact a lot of what I do are guesses. And then check whether it works. I think if you don't work like this you will be completely paralyzed to achieve anything.

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Agreed; I do this all the time as well. I don't think it as "guessing" per se, I think of it as forming a hypothesis based on the intersection of my existing knowledge of the problem and any new observations [1], then testing it to figure out if the hypothesis was correct. If proven incorrect, the process helps me reform into a new hypothesis and the cycle continues until the problem area becomes clear enough to solve outright.

[1] By reading more of the code, RTFM, observing logs, tracing with a debugger, varying inputs, etc.

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