1995 Lincoln Continental freeze plug

It depends on which one, and it'll still be very difficult. I've replaced freeze plugs on the front of some blocks by pulling the radiator/fan assembly. But even then it was hard to get the leverage needed to hammer the plugs in.

You could give it a go. But if they aren't seated correctly, they'll leak and you'll have overheating issues because the system won't build up and hold pressure.