Definitely use some good locking pliers. I used regular pliers and then cheap locking pliers on mine and mangled the end nub a bit. It came out easily when I used the good locking pliers that I should have used in the first place.
It's funny, I just saw Field Marshall's video he posted today on how he does it and it was basically what I did. After you guys said pull it out with pliers I said I'll give it a go. Went out to the shop and my Denix was laying next to my bench mounted vice so I figured why walk over to the tool chest (3 steps lol), so I clamped it up and gave it slight tug and voila! I have no idea how I will remove it after I grind it down and shape it like a firing pin and positioned slightly recessed, but I'll cross that bridge when it becomes necessary.