Initials is usually at 3 or 5 miles on the extended centerline of the runway in use.
You use the kit to tell you when you’re there. That might be as simple as TACAN or nowadays most likely IN/GPS position and range from a point (runway threshold for example).
In good weather you can just look out the window and judge it visually or using a ground feature if you’re familiar with the airfield.
BV