I did one last week on my 3.8 Windstar. It was in the front too, but I was lucky since it wasn't blocked by the exhaust manifold. You might need to remove the exhaust manifold to access the plug, if you don't have enough access to hammer the new one in.
Get a socket that fits on the inside of the new plug (right up to the edges, but it has to fit inside of it) and hammer it in with that, you have to apply the force to the edges as you hammer it in, not the center of the plug. To remove the old one, you need to dent the middle of it and possibly pop a hole through to work it loose. You can also buy rubber ones that you tighten in, that might be easier and even allow you to do it without removing anything.
Hope this helps!
P.S: forgot to mention that you should put some sort of sealer around the edge of the steel plug before hammering it in, I'm not sure about the rubber ones though.
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Last edited by JW657; 03-11-2011 at 06:18 PM.
Reason: more info