On feeling sure
Waiting to feel sure is the politest way to never decide. For a decision of real weight, certainty usually arrives after the choice, not before it, because it is made by commitment, not by analysis. The useful question is not do I feel sure but what specifically is my unsureness about.
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Certainty is a poor instrument
The feeling of being sure tracks comfort, recency and sleep at least as much as it tracks truth. People feel certain of things that are false every day, and feel uncertain of things they have already checked. If you would not let a mood veto a medical result, do not let it veto a decision you have actually examined.
Locate the unsureness
Unsureness is nearly always about one of three things: an unverified fact, an unsaid sentence, or an unaccepted cost. Find which. A fact can be checked. A sentence can be said, and the reply is information. A cost can only be accepted or refused, and no amount of further thinking converts a cost into not a cost. Most circling is the third kind pretending to be the first.
What steadies a decision
Three checks do more than a month of turning it over: whether the thing is sound as it already is, whether this is its season, and whether the one condition you are waiting on has actually been verified rather than hoped. Those three are checkable. Your feelings on a Tuesday are not.
If you want the season read
Crux exists for the second check. It will not tell you what you want, and it will not replace the sentence you have not said. It commits to when, and to what to verify first, and it says so in writing so you can hold it to it.