i always stand slightly to one side,rather than direct under window ,find it makes it easier . i use pole+a wagtail angle arm+ squeegee and going halfway up your ladder and poling from there is something i often do. i put the ladder to one side of the window and put the wagtail angle arm on ,upside down / if you look on youtube theres a few vids of an angle arm being used "upside down", its really good in that position .apart from the regular long poles , the short poles that are on sale in BnQ are really handy too , the Quickie3 part tele and the ANZA 2part are both so light,and id never leave home without both of these . the Anza one is so tiny i carry it in my b.o.a.b
i space my hands out along the pole ,both hands on Top of pole