I can access all of my interior windows except those on a wall of our second story family room. It required removing all the furniture so they could get ladders in. I could not/would not move our large sectional so I just did the outside.
I will do the inside windows myself - it's not hard. Maybe a step stool for a few of them since I'm short (or ask husband to do those).
After the exterior was done it really highlighted how badly the cleaning lady does the few windows she touches.