When I have to remove one I would put a towel over press then push out very slowly. I never had a problem but YMMV. Og course wear safety glasses while doing anything with primers.
Be safe
I've removed a bunch of them with no problem. Use your resizing die or universal depriming die and go slow and gentle. Wear safety glasses just because.......... Some shooters save them for reuse. I've never had a problem but save them for practice or plinking.
If its just primed brass (no bullet or powder), just chamber it, point the muzzle into a rag or shop towel and fire. Probably ought to run a wet, then dry patch down your barrel afterward....
I've removed live primers just by going very slow. However, for safety's sake, I prefer to put some water in the case and let it soak for a bit, then they're pretty harmless when so wet. Some people use a little oil to do render them harmless.
I've had to remove one that went in upside down. I just used my sizing die and went slow. Primers need a pretty sharp strike to go off so going slow presented no issues and I did have PPE in place.
Go slow as others have stated. When I deprime live primers, I bring the press ram up into the case and stop when I feel the pin hitting the flash hole, then very gently raise the ram, gently pushing out the primer with a 1/2" movement. Never had one go off even when I've put a primer in upside down. Wear safety glasses.
I realize this isn't what your asking but seems you've gotten safe responses.
Just fyi, I've had 3 go off using an RCBS hand squeeze style priming tool and forcing it into a crimped pocket on .223. I was forcing but not slamming them quite a bit.
I just had to "de-prime" 4 or 5 300 Win Mag rounds with Magnum primers. Pulled the bullets, dumped all the powder, chambered them and pointed at my archery target. Was basically like a cap gun going off.
Not sure if there's something innately horrible about that, but seemed safer to me. Anything coming out was going down the barrel in a safe direction...