For 737:
Arrive over final fix (say 5 mile final) at twice normal height above airfield elevation with flap 5. So 5 miles would be at 3000aal. Have the airfield elevation selected in the altitude MCP window and position the arc ("green banana") halfway down the runway. Select gear down flap 15 and keep the arc on halfway down the runway, selecting more flap as desired/possible to achieve landing at a reasonable speed. Works a treat. Common practise in the sim if I have time to spare, and a good confidence booster. On the NG the APU can be selected onto both busses to give normal gear and flap operation, whereas on the Classic one has to choose which bus to power....one giving normal gear but alternate flap or vice versa.