Can be tricky.
I like to wire brush it before soaking. Figure the more rust I can get off the better. I use a small wire wheel on a drill for this.
Then if it protrudes (looks like yours does), they will sometimes break free by just smashing it with a BAH (big hammer). I like the 3# hammer for this. But sometimes this mushrooms the top and then that much harder to drive through. Sometimes you can smash it from one direction to break it free, then drive it from the opposite direction to get it out.
Once its started it usually moves easier. As mentioned, roll pin punches are very useful (amazon has). Although I have used regular punches, they can slide off when hammering. (if you wanted you could always grind a nub on the end of a regular punch and you would have a roll pin punch)
A couple times I have used a palm nailer on top of a punch since I didnt have an air hammer. I reach for the air hammer second, the big hammer first.
Just assume you destroy it getting it out and buy some new pins for going back together.
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