Go ahead and run the case into you size die, or whatever you use to decap fired cases. Sheesh, guys.
Wear eye protection, and think about earplugs, because if you fire a primer in the press it's pretty loud; Even if you do manage to get one to pop, we aren't talking about dangerous explosions here.
I've deprimed live primers many hundreds of time, and usually re-use the primers, except if the primers are crimped in, because it bends the primers punching themout.
Yup.
Just throw on some eye protection and de-prime those buggers. I've done this more than a few times. Go slow.
