I find it very hard to manually conrol the speed and hit all the flap setting correctly on the 737. It seems (per the chart in the manual) you only have 10 kts between lowering the flaps from 5 deg to 15 deg, then another 10 kts to 25 deg and vRef 30 and Vref 40 (flaps 30 and 40) are soooo close.And say Vref is 137kts the chart says Flaps 15 at Vref 40 + 20. Atsay 160 KTS and flaps still at 10 deg, I am at 7.5 degrees nose up and I hear the drinks spilling in first class.I guess my question is: Is really realistic to hand fly an approach and manullay controlling the speed - or is this too much of a feat for a mere mortal. Also the chart in the manuals gives these as manuvering speeds - is this the corrrect landing flap settings?1 Vref 40 + 505 Vref 40 + 3010 Vref 40 + 30 (same as 5??)15 Vref 40 + 2025 Vref 40+ 1030 Vref 30 (144kts in my latest case)40 Vref 40 (137kts "")That's a lot of flap changes in a small window.