Before I went wfp I used to do a lot of awkward windows with the pole. Windows above conservatories usually.
Firstly I always use a microlite stand off at the top of my ladder.
By using the microlite you can get a lot closer to the window than trying to reach it from ground level. ( obvious :

)
I always carry a swivel squeegy with a normal 30 deggree angle and a swivel flat head squeegy 0 degree.
If you can, approach the window "front on" so you can then soap it up and blade off easier.
If you tighten the clamps on the pole so there is no spin on the pole at all it make the job easier.
I prefer to get level with the window and use the flat angled squeegy with the lock off so that the channel finds its own angle and keeps in touch with the glass.
I start at the top of the window and come down the panes in a wiggle side to side motion not in single straight down sweeps. ( although this works I find single top to bottom sweeps increases the chance of lines)
When the widow has been bladed I drape a clean micro fiber cloth over the squeegy and carfully wipe the top of the glass.
I carry a small cut down blade for sills that I then use to cut water off the sill. I drape a sill cloth over this as well to then wipe exess water off the sill.
In all it sounds a faff but with practice it can be done no time.