The trick: catch a fresh train within 2-4 days of launch. They're brilliantly visible then. Older satellites are dim and dispersed.
Check launchdetect.com/launches for the latest SpaceX Starlink mission.
Go to LaunchDetect's Starlink tracker or open the mobile app. Allow location.
Tonight's Sky lists visible passes with peak elevation, magnitude, sky direction.
Trains < 4 days old, peak elevation > 30°. Those are the magnitude +2 to +4 trains that anyone can see.
A Starlink train looks like a moving string of lights in a straight line. Distinctive — once you see one you won't mistake it for anything else.