Ring Lardner was an American sports columnist and short story writer in the beginning of the 20th Century. He wrote a lot about life in the sports world and the colorful characters that filled it up. He also gave us the following bit of wisdom that will help you in your supervision.
"The race may not always be to the swift, nor victory to the strong, but that's the way to bet."
That's a handy rule for an awful lot of life, and especially for supervision. Many times you don't have to choose the one right answer. Instead you make the best possible choice that you can.
You won't know in advance on a supervisory interview whether you will get the results you want. But you can do lots of things to improve the odds that things will come right.
Spend a lot of time around your people. Show up a lot. You will get to know them, and they will get to know you, and that makes for better supervisory interviews and better supervision.
Prepare in proportion to the importance and difficulty of the interview. Most of your interviews will be short and informal, but others will require far more formal preparation and notice.
Remember, follow Ring Lardner's guide and play the odds. It's the way to bet.