CATHIE - If you see the priesthood used wrong for almost your whole life, and this person doesn't live the way they should, then how can i make it so that i can sit through a lesson on the priesthood and ask someone to use that power, yet still be comfortable with it?

JOEL - I am not sure what you mean by "used wrong", but any priesthood ordinance performed by someone holding the priesthood is always valid even if the priesthood holder is not living a righteous life.
Perfection is not a requirement for priesthood bearers to be permitted to function in various ordinances and callings. Even though priesthood bearers are imperfect in many ways, the Lord allows them to carry out his work.
While local leaders will want to do everything they can to see that only worthy brethren perform the ordinances, the ordinance does not become invalid if someone involved is unworthy at the time he participates. The sanctity of the ordinance may be violated, but not the validity. The priesthood holder will be held accountable for performing the ordinance unworthily.