MEVER put ladders on a a surface which does not look stable or dry, do not go out of your way to please your customers or think its too easy money , It is life threatening up that height.
We are all confident , but if you fall you may be crippled for life, even end up in a wheel chair or worse for your family.
Young lads cannot see the danger, they are too clever for it to happen to them.
If you or anyone else are not comfortable , tell them you will look for someone to do it.
If you do any get a ladder stabilliser or any other safety equipment.
Have confidence but be 100% safe in your work.