No such thing as a sure bet. There are better percentages, but not a sure bet. You have to discern when to fold, when to bluff and when to go all in. You won't always be right, you definitely will raise your chances though. When you do lose you have to have the confidence that you will get it right even if you just failed.
What do I care what my headstone has on it. I won't know the difference if it has love or hate on it and neither will anyone else over time.