I would just leave it. If the customer moans, let them moan. They will be ok if you have an accident, but you wont.
Definately, DONT leave your ladder sticking up in the air and climb it unsupported. You really are asking for trouble to do that. The higher you go and further you lean, it'll be wanting to slip right away at the bottom.
I wouldnt even trust sandbags in such a situation.
Silly