You will need to push the top of the seal out with self made tool (heat and bend a thin cheap screwdriver, cut or grind the head off it and polish it up) or similar
while turning the crankshaft at the same time in the same direction you're pushing it.

One you get the top part of the seal out, how will you clean all that nasty rtv out of the seal groove, though?

For many years I've read the advice here to use rtv and other products on the back side of the dynamic seal (dynamic meaning the part the crankshaft rotates against),
I feel it is not needed and disagree.

RTV as a substitute for the side seals is okay. The old white asbestos side seals have always worked fine for me but I usually injected rtv after they
were installed. And since they stopped making them, it's been straight rtv after that.