Phillip Keller gives practical advice when an almost instant decision has to be made:
With an open mind ask God to guide unmistakably in listing the pros and cons on a divided sheet of paper. Being utterly honest before the Lord, ascribe 3 points to each reason – pro or con – of major importance. Ascribe 2 points to each reason of moderate importance. And give only 1 point to each reason of only minor importance. Then total up the figures. It will sometimes astonish one how overwhelming the evidence is for or against a decision. If one is as honest and objective as possible before God in this, it is proper to feel at peace about the outcome.
(Phillip Keller, “A Layman looks at the Lord’s Prayer”)