Hello, there is always a possibility of cards being damaged when being removed from a holder, although it is slim when done by a trained professional. The holders are designed to be tamper resistant and difficult to open on purpose.
Perfect 10 cards are not recommended to be reholdered as they are being retired, not removed. They are still being counted in the Population reports, they are just not assigning NEW perfect 10 grades moving forward. This means the ones that you already have will be even more rare in the future.