Use an electrically rated, fiberglass, ladder that will extend 4 full rungs above the roof needed to access. Slope of ladder should be about 4:1, height to distance from vertical.
Don't think your self a sissy for asking someone to foot the ladder, or tie it off.
I have a twenty+ year old, 24', Werner extension ladder. And a newer 10', fiberglass,Werner platform ladder, to clean gutters.
I always store my ladders out of direct sunlight.