When you stop looking at your phone while you're walking. When you lift your head and just look around, paying attention to sounds, smells, movement. When you observe the world around you.
Things change. You notice things. You realize there are lots of little details everywhere.
You don't need training for this.
Situational awareness allows for a better plan at the end. Recon your target, research online about the weather, patterns of life, terrain, streets, landmark features, history, crime. Then, if possible, go there, spend a day getting a feel for the play, how it works. Maybe talk to people.