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Report as you see fit. If the moderator finds the report correct, he’ll take action accordingly upon the reported post/thread/account (delete, merge, ban, move, lock, etc.).
The reporter should not really need to be worried for having made the report, although he may want to look at his own success ratio as time goes by, in order to get a sense of whether his criteria is seemingly correct in his reports. This gets noticeably easier when one reaches the 300 good report mark, which enables him to see the individual status of each of his reports, in a 30 day window (regrettably, you need to meet the 300 good reports before being able to see this option).
Note: I recall once people commenting what could happen if you’re reports were extremely poor (i.e. incorrect). The general idea was that nothing should really happen, unless you’re trying to troll the mods or such.
Note 2: I doubt it should really be much of a priority now in a recently created account. As time goes by, it's easier to stop cases one may wish to report.