Laying cutting wire around windscreen:

Starting from pull-in point, lay wire eyelet created on the outside counterclockwise around the windscreen
Pull excess wire into car interior

Fig 1: Laying Cutting Wire Around Windscreen
Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Make sure the cutting wire is located at all four corner points below the windscreen.

Check that the cutting wire is not caught on retainers or body.

Secure window on outside with adhesive tape against slipping

NOTE: Windows (1) with fitted seals (3) or sprayed-on surrounds:

Moisten cutting wire (4) and seals (3) on window (1) with water
Insert cutting wire (4) in bend (without kinking) between window (1) and body cutout (2)

Fig 2: Using Cutting Wire
Courtesy of BMW OF NORTH AMERICA, INC.