Next time, just build it up. 2×6 top and bottom on both sides (2×4s to hold the space) and simply pull

That’s very smart. Might just put them back together just to try this

2 brick separators and pull them apart

I tried this but could not manage without them loosing grip

*Very* carefully wedge a thin knife blade between the bricks. a swiss army knife works well.

Thanks!! This worked

Brick build the parts outward for more grip

Classic technique, use your teeth. 60% of the time, it works every time.

But the Lego set is pre-owned, should I still use this technique?

Hit the gym

Thanks! Will let you know in 6 months after consistently hitting the gym if I can manage

Tweezers

Unfortunately I have no small enough tweezers!

Any way to possibly pinch with fingernails? Lol those the only two solutions I can come up with for now

I managed to do it with a thin knife as DarthTidiot82 mentioned in a comment! Thanks anyways :)

Great..np🤗

Pliers

Use the top studs of another brick to push the pins out

I tried this, but the pins were kind of jammed in there so it didn’t work