Back in the film day, there was no instant feedback on your photoshoot. You had to wait for the development process to see the results. So... you know where I am going with this. Try this on a not-so-important shoot, or try on some random exercise to learn.
If you have a back screen, either shut it off in the menu or flip it so that it is not visible. During the shoot, do not look at any of your photos on the back screen. Don't even look at them when you get home. Instead, use your computer and review your work. How did you do?