It can be a challenge to get the ball joints out. Looks like your upper failed. When removing and replacing you can use a pickle fork and pound it in. When reusing they make a balljoints removing tool.

It can be done though. That pickle fork is cheap to buy. Or even rent. Just pound away. The nuts can strip holding the top side. Then you have it apart and are in trouble.

I would say be careful driving it. I've had one come apart before.