In the 747, just remember "Flaps 20, 220". For just about the best descent angle you can get in the terminal area, go to idle, put the gear down, flaps to whatever is allowed by current speed, speedbrakes out if desired, slow to 220, Flaps 20, descend at 220 KIAS. Approaching desired altitude or glidepath, thrust to 40% N1 or more, speedbrakes in, decel and landing flaps as desired.
Works fine, every time!