That is something new agents and some experienced agents struggle with regularly. It will help you evaluate each person the same. The doctor sends you through the same steps as every other patient taking an annual physical.
All patients have their blood pressure checked and blood and urine sample tested.
The doctors and nurses don't skip a step. There is no substitute for experience. Like anything in life, the more you do something the better you get. Michael Jordan was the greatest basketball player of all time because of will and practice. The experience of working with many prospects and clients helps you develop a sixth sense.